done

node_modules/engine.io/LICENSE

@@ -0,0 +1,19 @@
+(The MIT License)
+
+Copyright (c) 2014-present Guillermo Rauch and Socket.IO contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
+and associated documentation files (the 'Software'), to deal in the Software without restriction, 
+including without limitation the rights to use, copy, modify, merge, publish, distribute, 
+sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or 
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
+BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

node_modules/engine.io/README.md

@@ -0,0 +1,603 @@
+
+# Engine.IO: the realtime engine
+
+[![Build Status](https://github.com/socketio/engine.io/workflows/CI/badge.svg?branch=master)](https://github.com/socketio/engine.io/actions)
+[![NPM version](https://badge.fury.io/js/engine.io.svg)](http://badge.fury.io/js/engine.io)
+
+`Engine.IO` is the implementation of transport-based
+cross-browser/cross-device bi-directional communication layer for
+[Socket.IO](http://github.com/socketio/socket.io).
+
+## How to use
+
+### Server
+
+#### (A) Listening on a port
+
+```js
+const engine = require('engine.io');
+const server = engine.listen(80);
+
+server.on('connection', socket => {
+  socket.send('utf 8 string');
+  socket.send(Buffer.from([0, 1, 2, 3, 4, 5])); // binary data
+});
+```
+
+#### (B) Intercepting requests for a http.Server
+
+```js
+const engine = require('engine.io');
+const http = require('http').createServer().listen(3000);
+const server = engine.attach(http);
+
+server.on('connection', socket => {
+  socket.on('message', data => { });
+  socket.on('close', () => { });
+});
+```
+
+#### (C) Passing in requests
+
+```js
+const engine = require('engine.io');
+const server = new engine.Server();
+
+server.on('connection', socket => {
+  socket.send('hi');
+});
+
+// …
+httpServer.on('upgrade', (req, socket, head) => {
+  server.handleUpgrade(req, socket, head);
+});
+
+httpServer.on('request', (req, res) => {
+  server.handleRequest(req, res);
+});
+```
+
+### Client
+
+```html
+<script src="/path/to/engine.io.js"></script>
+<script>
+  const socket = new eio.Socket('ws://localhost/');
+  socket.on('open', () => {
+    socket.on('message', data => {});
+    socket.on('close', () => {});
+  });
+</script>
+```
+
+For more information on the client refer to the
+[engine-client](http://github.com/socketio/engine.io-client) repository.
+
+## What features does it have?
+
+- **Maximum reliability**. Connections are established even in the presence of:
+  - proxies and load balancers.
+  - personal firewall and antivirus software.
+  - for more information refer to **Goals** and **Architecture** sections
+- **Minimal client size** aided by:
+  - lazy loading of flash transports.
+  - lack of redundant transports.
+- **Scalable**
+  - load balancer friendly
+- **Future proof**
+- **100% Node.JS core style**
+  - No API sugar (left for higher level projects)
+
+## API
+
+### Server
+
+<hr><br>
+
+#### Top-level
+
+These are exposed by `require('engine.io')`:
+
+##### Events
+
+- `flush`
+    - Called when a socket buffer is being flushed.
+    - **Arguments**
+      - `Socket`: socket being flushed
+      - `Array`: write buffer
+- `drain`
+    - Called when a socket buffer is drained
+    - **Arguments**
+      - `Socket`: socket being flushed
+
+##### Properties
+
+- `protocol` _(Number)_: protocol revision number
+- `Server`: Server class constructor
+- `Socket`: Socket class constructor
+- `Transport` _(Function)_: transport constructor
+- `transports` _(Object)_: map of available transports
+
+##### Methods
+
+- `()`
+    - Returns a new `Server` instance. If the first argument is an `http.Server` then the
+      new `Server` instance will be attached to it. Otherwise, the arguments are passed
+      directly to the `Server` constructor.
+    - **Parameters**
+      - `http.Server`: optional, server to attach to.
+      - `Object`: optional, options object (see `Server#constructor` api docs below)
+
+  The following are identical ways to instantiate a server and then attach it.
+
+```js
+const httpServer; // previously created with `http.createServer();` from node.js api.
+
+// create a server first, and then attach
+const eioServer = require('engine.io').Server();
+eioServer.attach(httpServer);
+
+// or call the module as a function to get `Server`
+const eioServer = require('engine.io')();
+eioServer.attach(httpServer);
+
+// immediately attach
+const eioServer = require('engine.io')(httpServer);
+
+// with custom options
+const eioServer = require('engine.io')(httpServer, {
+  maxHttpBufferSize: 1e3
+});
+```
+
+- `listen`
+    - Creates an `http.Server` which listens on the given port and attaches WS
+      to it. It returns `501 Not Implemented` for regular http requests.
+    - **Parameters**
+      - `Number`: port to listen on.
+      - `Object`: optional, options object
+      - `Function`: callback for `listen`.
+    - **Options**
+      - All options from `Server.attach` method, documented below.
+      - **Additionally** See Server `constructor` below for options you can pass for creating the new Server
+    - **Returns** `Server`
+
+```js
+const engine = require('engine.io');
+const server = engine.listen(3000, {
+  pingTimeout: 2000,
+  pingInterval: 10000
+});
+
+server.on('connection', /* ... */);
+```
+
+- `attach`
+    - Captures `upgrade` requests for a `http.Server`. In other words, makes
+      a regular http.Server WebSocket-compatible.
+    - **Parameters**
+      - `http.Server`: server to attach to.
+      - `Object`: optional, options object
+    - **Options**
+      - All options from `Server.attach` method, documented below.
+      - **Additionally** See Server `constructor` below for options you can pass for creating the new Server
+    - **Returns** `Server` a new Server instance.
+
+```js
+const engine = require('engine.io');
+const httpServer = require('http').createServer().listen(3000);
+const server = engine.attach(httpServer, {
+  wsEngine: require('eiows').Server // requires having eiows as dependency
+});
+
+server.on('connection', /* ... */);
+```
+
+#### Server
+
+The main server/manager. _Inherits from EventEmitter_.
+
+##### Events
+
+- `connection`
+    - Fired when a new connection is established.
+    - **Arguments**
+      - `Socket`: a Socket object
+
+- `initial_headers`
+    - Fired on the first request of the connection, before writing the response headers
+    - **Arguments**
+      - `headers` (`Object`): a hash of headers
+      - `req` (`http.IncomingMessage`): the request
+
+- `headers`
+    - Fired on the all requests of the connection, before writing the response headers
+    - **Arguments**
+      - `headers` (`Object`): a hash of headers
+      - `req` (`http.IncomingMessage`): the request
+
+- `connection_error`
+    - Fired when an error occurs when establishing the connection.
+    - **Arguments**
+      - `error`: an object with following properties:
+        - `req` (`http.IncomingMessage`): the request that was dropped
+        - `code` (`Number`): one of `Server.errors`
+        - `message` (`string`): one of `Server.errorMessages`
+        - `context` (`Object`): extra info about the error
+
+| Code | Message |
+| ---- | ------- |
+| 0 | "Transport unknown"
+| 1 | "Session ID unknown"
+| 2 | "Bad handshake method"
+| 3 | "Bad request"
+| 4 | "Forbidden"
+| 5 | "Unsupported protocol version"
+
+
+##### Properties
+
+**Important**: if you plan to use Engine.IO in a scalable way, please
+keep in mind the properties below will only reflect the clients connected
+to a single process.
+
+- `clients` _(Object)_: hash of connected clients by id.
+- `clientsCount` _(Number)_: number of connected clients.
+
+##### Methods
+
+- **constructor**
+    - Initializes the server
+    - **Parameters**
+      - `Object`: optional, options object
+    - **Options**
+      - `pingTimeout` (`Number`): how many ms without a pong packet to
+        consider the connection closed (`20000`)
+      - `pingInterval` (`Number`): how many ms before sending a new ping
+        packet (`25000`)
+      - `upgradeTimeout` (`Number`): how many ms before an uncompleted transport upgrade is cancelled (`10000`)
+      - `maxHttpBufferSize` (`Number`): how many bytes or characters a message
+        can be, before closing the session (to avoid DoS). Default
+        value is `1E6`.
+      - `allowRequest` (`Function`): A function that receives a given handshake
+        or upgrade request as its first parameter, and can decide whether to
+        continue or not. The second argument is a function that needs to be
+        called with the decided information: `fn(err, success)`, where
+        `success` is a boolean value where false means that the request is
+        rejected, and err is an error code.
+      - `transports` (`<Array> String`): transports to allow connections
+        to (`['polling', 'websocket']`)
+      - `allowUpgrades` (`Boolean`): whether to allow transport upgrades
+        (`true`)
+      - `perMessageDeflate` (`Object|Boolean`): parameters of the WebSocket permessage-deflate extension
+        (see [ws module](https://github.com/einaros/ws) api docs). Set to `true` to enable. (defaults to `false`)
+        - `threshold` (`Number`): data is compressed only if the byte size is above this value (`1024`)
+      - `httpCompression` (`Object|Boolean`): parameters of the http compression for the polling transports
+        (see [zlib](http://nodejs.org/api/zlib.html#zlib_options) api docs). Set to `false` to disable. (`true`)
+        - `threshold` (`Number`): data is compressed only if the byte size is above this value (`1024`)
+      - `cookie` (`Object|Boolean`): configuration of the cookie that
+        contains the client sid to send as part of handshake response
+        headers. This cookie might be used for sticky-session. Defaults to not sending any cookie (`false`).
+        See [here](https://github.com/jshttp/cookie#options-1) for all supported options.
+      - `wsEngine` (`Function`): what WebSocket server implementation to use. Specified module must conform to the `ws` interface (see [ws module api docs](https://github.com/websockets/ws/blob/master/doc/ws.md)). Default value is `ws`. An alternative c++ addon is also available by installing `eiows` module.
+      - `cors` (`Object`): the options that will be forwarded to the cors module. See [there](https://github.com/expressjs/cors#configuration-options) for all available options. Defaults to no CORS allowed.
+      - `initialPacket` (`Object`): an optional packet which will be concatenated to the handshake packet emitted by Engine.IO.
+      - `allowEIO3` (`Boolean`): whether to support v3 Engine.IO clients (defaults to `false`)
+- `close`
+    - Closes all clients
+    - **Returns** `Server` for chaining
+- `handleRequest`
+    - Called internally when a `Engine` request is intercepted.
+    - **Parameters**
+      - `http.IncomingMessage`: a node request object
+      - `http.ServerResponse`: a node response object
+    - **Returns** `Server` for chaining
+- `handleUpgrade`
+    - Called internally when a `Engine` ws upgrade is intercepted.
+    - **Parameters** (same as `upgrade` event)
+      - `http.IncomingMessage`: a node request object
+      - `net.Stream`: TCP socket for the request
+      - `Buffer`: legacy tail bytes
+    - **Returns** `Server` for chaining
+- `attach`
+    - Attach this Server instance to an `http.Server`
+    - Captures `upgrade` requests for a `http.Server`. In other words, makes
+      a regular http.Server WebSocket-compatible.
+    - **Parameters**
+      - `http.Server`: server to attach to.
+      - `Object`: optional, options object
+    - **Options**
+      - `path` (`String`): name of the path to capture (`/engine.io`).
+      - `destroyUpgrade` (`Boolean`): destroy unhandled upgrade requests (`true`)
+      - `destroyUpgradeTimeout` (`Number`): milliseconds after which unhandled requests are ended (`1000`)
+- `generateId`
+    - Generate a socket id.
+    - Overwrite this method to generate your custom socket id.
+    - **Parameters**
+      - `http.IncomingMessage`: a node request object
+  - **Returns** A socket id for connected client.
+
+<hr><br>
+
+#### Socket
+
+A representation of a client. _Inherits from EventEmitter_.
+
+##### Events
+
+- `close`
+    - Fired when the client is disconnected.
+    - **Arguments**
+      - `String`: reason for closing
+      - `Object`: description object (optional)
+- `message`
+    - Fired when the client sends a message.
+    - **Arguments**
+      - `String` or `Buffer`: Unicode string or Buffer with binary contents
+- `error`
+    - Fired when an error occurs.
+    - **Arguments**
+      - `Error`: error object
+- `upgrading`
+    - Fired when the client starts the upgrade to a better transport like WebSocket.
+    - **Arguments**
+        - `Object`: the transport
+- `upgrade`
+    - Fired when the client completes the upgrade to a better transport like WebSocket.
+    - **Arguments**
+        - `Object`: the transport
+- `flush`
+    - Called when the write buffer is being flushed.
+    - **Arguments**
+      - `Array`: write buffer
+- `drain`
+    - Called when the write buffer is drained
+- `packet`
+    - Called when a socket received a packet (`message`, `ping`)
+    - **Arguments**
+      - `type`: packet type
+      - `data`: packet data (if type is message)
+- `packetCreate`
+    - Called before a socket sends a packet (`message`, `ping`)
+    - **Arguments**
+      - `type`: packet type
+      - `data`: packet data (if type is message)
+- `heartbeat`
+    - Called when `ping` or `pong` packed is received (depends of client version)
+
+##### Properties
+
+- `id` _(String)_: unique identifier
+- `server` _(Server)_: engine parent reference
+- `request` _(http.IncomingMessage)_: request that originated the Socket
+- `upgraded` _(Boolean)_: whether the transport has been upgraded
+- `readyState` _(String)_: opening|open|closing|closed
+- `transport` _(Transport)_: transport reference
+
+##### Methods
+
+- `send`:
+    - Sends a message, performing `message = toString(arguments[0])` unless
+      sending binary data, which is sent as is.
+    - **Parameters**
+      - `String` | `Buffer` | `ArrayBuffer` | `ArrayBufferView`: a string or any object implementing `toString()`, with outgoing data, or a Buffer or ArrayBuffer with binary data. Also any ArrayBufferView can be sent as is.
+      - `Object`: optional, options object
+      - `Function`: optional, a callback executed when the message gets flushed out by the transport
+    - **Options**
+      - `compress` (`Boolean`): whether to compress sending data. This option might be ignored and forced to be `true` when using polling. (`true`)
+    - **Returns** `Socket` for chaining
+- `close`
+    - Disconnects the client
+    - **Returns** `Socket` for chaining
+
+### Client
+
+<hr><br>
+
+Exposed in the `eio` global namespace (in the browser), or by
+`require('engine.io-client')` (in Node.JS).
+
+For the client API refer to the
+[engine-client](http://github.com/learnboost/engine.io-client) repository.
+
+## Debug / logging
+
+Engine.IO is powered by [debug](http://github.com/visionmedia/debug).
+In order to see all the debug output, run your app with the environment variable
+`DEBUG` including the desired scope.
+
+To see the output from all of Engine.IO's debugging scopes you can use:
+
+```
+DEBUG=engine* node myapp
+```
+
+## Transports
+
+- `polling`: XHR / JSONP polling transport.
+- `websocket`: WebSocket transport.
+
+## Plugins
+
+- [engine.io-conflation](https://github.com/EugenDueck/engine.io-conflation): Makes **conflation and aggregation** of messages straightforward.
+
+## Support
+
+The support channels for `engine.io` are the same as `socket.io`:
+  - irc.freenode.net **#socket.io**
+  - [Google Groups](http://groups.google.com/group/socket_io)
+  - [Website](http://socket.io)
+
+## Development
+
+To contribute patches, run tests or benchmarks, make sure to clone the
+repository:
+
+```
+git clone git://github.com/LearnBoost/engine.io.git
+```
+
+Then:
+
+```
+cd engine.io
+npm install
+```
+
+## Tests
+
+Tests run with `npm test`. It runs the server tests that are aided by
+the usage of `engine.io-client`.
+
+Make sure `npm install` is run first.
+
+## Goals
+
+The main goal of `Engine` is ensuring the most reliable realtime communication.
+Unlike the previous Socket.IO core, it always establishes a long-polling
+connection first, then tries to upgrade to better transports that are "tested" on
+the side.
+
+During the lifetime of the Socket.IO projects, we've found countless drawbacks
+to relying on `HTML5 WebSocket` or `Flash Socket` as the first connection
+mechanisms.
+
+Both are clearly the _right way_ of establishing a bidirectional communication,
+with HTML5 WebSocket being the way of the future. However, to answer most business
+needs, alternative traditional HTTP 1.1 mechanisms are just as good as delivering
+the same solution.
+
+WebSocket based connections have two fundamental benefits:
+
+1. **Better server performance**
+  - _A: Load balancers_<br>
+      Load balancing a long polling connection poses a serious architectural nightmare
+      since requests can come from any number of open sockets by the user agent, but
+      they all need to be routed to the process and computer that owns the `Engine`
+      connection. This negatively impacts RAM and CPU usage.
+  - _B: Network traffic_<br>
+      WebSocket is designed around the premise that each message frame has to be
+      surrounded by the least amount of data. In HTTP 1.1 transports, each message
+      frame is surrounded by HTTP headers and chunked encoding frames. If you try to
+      send the message _"Hello world"_ with xhr-polling, the message ultimately
+      becomes larger than if you were to send it with WebSocket.
+  - _C: Lightweight parser_<br>
+      As an effect of **B**, the server has to do a lot more work to parse the network
+      data and figure out the message when traditional HTTP requests are used
+      (as in long polling). This means that another advantage of WebSocket is
+      less server CPU usage.
+
+2. **Better user experience**
+
+    Due to the reasons stated in point **1**, the most important effect of being able
+    to establish a WebSocket connection is raw data transfer speed, which translates
+    in _some_ cases in better user experience.
+
+    Applications with heavy realtime interaction (such as games) will benefit greatly,
+    whereas applications like realtime chat (Gmail/Facebook), newsfeeds (Facebook) or
+    timelines (Twitter) will have negligible user experience improvements.
+
+Having said this, attempting to establish a WebSocket connection directly so far has
+proven problematic:
+
+1. **Proxies**<br>
+    Many corporate proxies block WebSocket traffic.
+
+2. **Personal firewall and antivirus software**<br>
+    As a result of our research, we've found that at least 3 personal security
+    applications block WebSocket traffic.
+
+3. **Cloud application platforms**<br>
+    Platforms like Heroku or No.de have had trouble keeping up with the fast-paced
+    nature of the evolution of the WebSocket protocol. Applications therefore end up
+    inevitably using long polling, but the seamless installation experience of
+    Socket.IO we strive for (_"require() it and it just works"_) disappears.
+
+Some of these problems have solutions. In the case of proxies and personal programs,
+however, the solutions many times involve upgrading software. Experience has shown
+that relying on client software upgrades to deliver a business solution is
+fruitless: the very existence of this project has to do with a fragmented panorama
+of user agent distribution, with clients connecting with latest versions of the most
+modern user agents (Chrome, Firefox and Safari), but others with versions as low as
+IE 5.5.
+
+From the user perspective, an unsuccessful WebSocket connection can translate in
+up to at least 10 seconds of waiting for the realtime application to begin
+exchanging data. This **perceptively** hurts user experience.
+
+To summarize, **Engine** focuses on reliability and user experience first, marginal
+potential UX improvements and increased server performance second. `Engine` is the
+result of all the lessons learned with WebSocket in the wild.
+
+## Architecture
+
+The main premise of `Engine`, and the core of its existence, is the ability to
+swap transports on the fly. A connection starts as xhr-polling, but it can
+switch to WebSocket.
+
+The central problem this poses is: how do we switch transports without losing
+messages?
+
+`Engine` only switches from polling to another transport in between polling
+cycles. Since the server closes the connection after a certain timeout when
+there's no activity, and the polling transport implementation buffers messages
+in between connections, this ensures no message loss and optimal performance.
+
+Another benefit of this design is that we workaround almost all the limitations
+of **Flash Socket**, such as slow connection times, increased file size (we can
+safely lazy load it without hurting user experience), etc.
+
+## FAQ
+
+### Can I use engine without Socket.IO ?
+
+Absolutely. Although the recommended framework for building realtime applications
+is Socket.IO, since it provides fundamental features for real-world applications
+such as multiplexing, reconnection support, etc.
+
+`Engine` is to Socket.IO what Connect is to Express. An essential piece for building
+realtime frameworks, but something you _probably_ won't be using for building
+actual applications.
+
+### Does the server serve the client?
+
+No. The main reason is that `Engine` is meant to be bundled with frameworks.
+Socket.IO includes `Engine`, therefore serving two clients is not necessary. If
+you use Socket.IO, including
+
+```html
+<script src="/socket.io/socket.io.js">
+```
+
+has you covered.
+
+### Can I implement `Engine` in other languages?
+
+Absolutely. The [engine.io-protocol](https://github.com/socketio/engine.io-protocol)
+repository contains the most up-to-date description of the specification
+at all times.
+
+## License
+
+(The MIT License)
+
+Copyright (c) 2014 Guillermo Rauch &lt;guillermo@learnboost.com&gt;
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/engine.io/build/contrib/types.cookie.d.ts

@@ -0,0 +1,113 @@
+/**
+ * Basic HTTP cookie parser and serializer for HTTP servers.
+ */
+/**
+ * Additional serialization options
+ */
+export interface CookieSerializeOptions {
+    /**
+     * Specifies the value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.3|Domain Set-Cookie attribute}. By default, no
+     * domain is set, and most clients will consider the cookie to apply to only
+     * the current domain.
+     */
+    domain?: string | undefined;
+    /**
+     * Specifies a function that will be used to encode a cookie's value. Since
+     * value of a cookie has a limited character set (and must be a simple
+     * string), this function can be used to encode a value into a string suited
+     * for a cookie's value.
+     *
+     * The default function is the global `encodeURIComponent`, which will
+     * encode a JavaScript string into UTF-8 byte sequences and then URL-encode
+     * any that fall outside of the cookie range.
+     */
+    encode?(value: string): string;
+    /**
+     * Specifies the `Date` object to be the value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.1|`Expires` `Set-Cookie` attribute}. By default,
+     * no expiration is set, and most clients will consider this a "non-persistent cookie" and will delete
+     * it on a condition like exiting a web browser application.
+     *
+     * *Note* the {@link https://tools.ietf.org/html/rfc6265#section-5.3|cookie storage model specification}
+     * states that if both `expires` and `maxAge` are set, then `maxAge` takes precedence, but it is
+     * possible not all clients by obey this, so if both are set, they should
+     * point to the same date and time.
+     */
+    expires?: Date | undefined;
+    /**
+     * Specifies the boolean value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.6|`HttpOnly` `Set-Cookie` attribute}.
+     * When truthy, the `HttpOnly` attribute is set, otherwise it is not. By
+     * default, the `HttpOnly` attribute is not set.
+     *
+     * *Note* be careful when setting this to true, as compliant clients will
+     * not allow client-side JavaScript to see the cookie in `document.cookie`.
+     */
+    httpOnly?: boolean | undefined;
+    /**
+     * Specifies the number (in seconds) to be the value for the `Max-Age`
+     * `Set-Cookie` attribute. The given number will be converted to an integer
+     * by rounding down. By default, no maximum age is set.
+     *
+     * *Note* the {@link https://tools.ietf.org/html/rfc6265#section-5.3|cookie storage model specification}
+     * states that if both `expires` and `maxAge` are set, then `maxAge` takes precedence, but it is
+     * possible not all clients by obey this, so if both are set, they should
+     * point to the same date and time.
+     */
+    maxAge?: number | undefined;
+    /**
+     * Specifies the `boolean` value for the [`Partitioned` `Set-Cookie`](rfc-cutler-httpbis-partitioned-cookies)
+     * attribute. When truthy, the `Partitioned` attribute is set, otherwise it is not. By default, the
+     * `Partitioned` attribute is not set.
+     *
+     * **note** This is an attribute that has not yet been fully standardized, and may change in the future.
+     * This also means many clients may ignore this attribute until they understand it.
+     *
+     * More information about can be found in [the proposal](https://github.com/privacycg/CHIPS)
+     */
+    partitioned?: boolean | undefined;
+    /**
+     * Specifies the value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.4|`Path` `Set-Cookie` attribute}.
+     * By default, the path is considered the "default path".
+     */
+    path?: string | undefined;
+    /**
+     * Specifies the `string` to be the value for the [`Priority` `Set-Cookie` attribute][rfc-west-cookie-priority-00-4.1].
+     *
+     * - `'low'` will set the `Priority` attribute to `Low`.
+     * - `'medium'` will set the `Priority` attribute to `Medium`, the default priority when not set.
+     * - `'high'` will set the `Priority` attribute to `High`.
+     *
+     * More information about the different priority levels can be found in
+     * [the specification][rfc-west-cookie-priority-00-4.1].
+     *
+     * **note** This is an attribute that has not yet been fully standardized, and may change in the future.
+     * This also means many clients may ignore this attribute until they understand it.
+     */
+    priority?: "low" | "medium" | "high" | undefined;
+    /**
+     * Specifies the boolean or string to be the value for the {@link https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-03#section-4.1.2.7|`SameSite` `Set-Cookie` attribute}.
+     *
+     * - `true` will set the `SameSite` attribute to `Strict` for strict same
+     * site enforcement.
+     * - `false` will not set the `SameSite` attribute.
+     * - `'lax'` will set the `SameSite` attribute to Lax for lax same site
+     * enforcement.
+     * - `'strict'` will set the `SameSite` attribute to Strict for strict same
+     * site enforcement.
+     *  - `'none'` will set the SameSite attribute to None for an explicit
+     *  cross-site cookie.
+     *
+     * More information about the different enforcement levels can be found in {@link https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-03#section-4.1.2.7|the specification}.
+     *
+     * *note* This is an attribute that has not yet been fully standardized, and may change in the future. This also means many clients may ignore this attribute until they understand it.
+     */
+    sameSite?: true | false | "lax" | "strict" | "none" | undefined;
+    /**
+     * Specifies the boolean value for the {@link https://tools.ietf.org/html/rfc6265#section-5.2.5|`Secure` `Set-Cookie` attribute}. When truthy, the
+     * `Secure` attribute is set, otherwise it is not. By default, the `Secure` attribute is not set.
+     *
+     * *Note* be careful when setting this to `true`, as compliant clients will
+     * not send the cookie back to the server in the future if the browser does
+     * not have an HTTPS connection.
+     */
+    secure?: boolean | undefined;
+}

node_modules/engine.io/build/contrib/types.cookie.js

@@ -0,0 +1,6 @@
+"use strict";
+// imported from https://github.com/DefinitelyTyped/DefinitelyTyped/blob/b83cf9ef8b044e69f05b2a00aa7c6cb767a9acd2/types/cookie/index.d.ts (now deleted)
+/**
+ * Basic HTTP cookie parser and serializer for HTTP servers.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });

node_modules/engine.io/build/engine.io.d.ts

@@ -0,0 +1,27 @@
+import { Server as HttpServer } from "http";
+import { Server, AttachOptions, ServerOptions } from "./server";
+import transports from "./transports/index";
+import * as parser from "engine.io-parser";
+export { Server, transports, listen, attach, parser };
+export type { AttachOptions, ServerOptions, BaseServer, ErrorCallback, } from "./server";
+export { uServer } from "./userver";
+export { Socket } from "./socket";
+export { Transport } from "./transport";
+export declare const protocol = 4;
+/**
+ * Creates an http.Server exclusively used for WS upgrades, and starts listening.
+ *
+ * @param port
+ * @param options
+ * @param listenCallback - callback for http.Server.listen()
+ * @return engine.io server
+ */
+declare function listen(port: number, options?: AttachOptions & ServerOptions, listenCallback?: () => void): Server;
+/**
+ * Captures upgrade requests for a http.Server.
+ *
+ * @param server
+ * @param options
+ * @return engine.io server
+ */
+declare function attach(server: HttpServer, options: AttachOptions & ServerOptions): Server;

node_modules/engine.io/build/engine.io.js

@@ -0,0 +1,54 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.protocol = exports.Transport = exports.Socket = exports.uServer = exports.parser = exports.transports = exports.Server = void 0;
+exports.listen = listen;
+exports.attach = attach;
+const http_1 = require("http");
+const server_1 = require("./server");
+Object.defineProperty(exports, "Server", { enumerable: true, get: function () { return server_1.Server; } });
+const index_1 = require("./transports/index");
+exports.transports = index_1.default;
+const parser = require("engine.io-parser");
+exports.parser = parser;
+var userver_1 = require("./userver");
+Object.defineProperty(exports, "uServer", { enumerable: true, get: function () { return userver_1.uServer; } });
+var socket_1 = require("./socket");
+Object.defineProperty(exports, "Socket", { enumerable: true, get: function () { return socket_1.Socket; } });
+var transport_1 = require("./transport");
+Object.defineProperty(exports, "Transport", { enumerable: true, get: function () { return transport_1.Transport; } });
+exports.protocol = parser.protocol;
+/**
+ * Creates an http.Server exclusively used for WS upgrades, and starts listening.
+ *
+ * @param port
+ * @param options
+ * @param listenCallback - callback for http.Server.listen()
+ * @return engine.io server
+ */
+function listen(port, options, listenCallback) {
+    if ("function" === typeof options) {
+        listenCallback = options;
+        options = {};
+    }
+    const server = (0, http_1.createServer)(function (req, res) {
+        res.writeHead(501);
+        res.end("Not Implemented");
+    });
+    // create engine server
+    const engine = attach(server, options);
+    engine.httpServer = server;
+    server.listen(port, listenCallback);
+    return engine;
+}
+/**
+ * Captures upgrade requests for a http.Server.
+ *
+ * @param server
+ * @param options
+ * @return engine.io server
+ */
+function attach(server, options) {
+    const engine = new server_1.Server(options);
+    engine.attach(server, options);
+    return engine;
+}

node_modules/engine.io/build/parser-v3/index.d.ts

@@ -0,0 +1,88 @@
+/**
+ * Current protocol version.
+ */
+export declare const protocol = 3;
+/**
+ * Packet types.
+ */
+export declare const packets: {
+    open: number;
+    close: number;
+    ping: number;
+    pong: number;
+    message: number;
+    upgrade: number;
+    noop: number;
+};
+/**
+ * Encodes a packet.
+ *
+ *     <packet type id> [ <data> ]
+ *
+ * Example:
+ *
+ *     5hello world
+ *     3
+ *     4
+ *
+ * Binary is encoded in an identical principle
+ *
+ * @api private
+ */
+export declare function encodePacket(packet: any, supportsBinary?: any, utf8encode?: any, callback?: any): any;
+/**
+ * Encodes a packet with binary data in a base64 string
+ *
+ * @param {Object} packet, has `type` and `data`
+ * @return {String} base64 encoded message
+ */
+export declare function encodeBase64Packet(packet: any, callback: any): any;
+/**
+ * Decodes a packet. Data also available as an ArrayBuffer if requested.
+ *
+ * @return {import('engine.io-parser').Packet} with `type` and `data` (if any)
+ * @api private
+ */
+export declare function decodePacket(data: any, binaryType?: any, utf8decode?: any): any;
+/**
+ * Decodes a packet encoded in a base64 string.
+ *
+ * @param {String} base64 encoded message
+ * @return {Object} with `type` and `data` (if any)
+ */
+export declare function decodeBase64Packet(msg: any, binaryType: any): {
+    type: string;
+    data: Buffer;
+};
+/**
+ * Encodes multiple messages (payload).
+ *
+ *     <length>:data
+ *
+ * Example:
+ *
+ *     11:hello world2:hi
+ *
+ * If any contents are binary, they will be encoded as base64 strings. Base64
+ * encoded strings are marked with a b before the length specifier
+ *
+ * @param {Array} packets
+ * @api private
+ */
+export declare function encodePayload(packets: any, supportsBinary: any, callback: any): any;
+export declare function decodePayload(data: any, binaryType?: any, callback?: any): any;
+/**
+ * Encodes multiple messages (payload) as binary.
+ *
+ * <1 = binary, 0 = string><number from 0-9><number from 0-9>[...]<number
+ * 255><data>
+ *
+ * Example:
+ * 1 3 255 1 2 3, if the binary contents are interpreted as 8 bit integers
+ *
+ * @param {Array} packets
+ * @return {Buffer} encoded payload
+ * @api private
+ */
+export declare function encodePayloadAsBinary(packets: any, callback: any): any;
+export declare function decodePayloadAsBinary(data: any, binaryType: any, callback: any): any;

node_modules/engine.io/build/parser-v3/index.js

@@ -0,0 +1,424 @@
+"use strict";
+// imported from https://github.com/socketio/engine.io-parser/tree/2.2.x
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.packets = exports.protocol = void 0;
+exports.encodePacket = encodePacket;
+exports.encodeBase64Packet = encodeBase64Packet;
+exports.decodePacket = decodePacket;
+exports.decodeBase64Packet = decodeBase64Packet;
+exports.encodePayload = encodePayload;
+exports.decodePayload = decodePayload;
+exports.encodePayloadAsBinary = encodePayloadAsBinary;
+exports.decodePayloadAsBinary = decodePayloadAsBinary;
+/**
+ * Module dependencies.
+ */
+var utf8 = require('./utf8');
+/**
+ * Current protocol version.
+ */
+exports.protocol = 3;
+const hasBinary = (packets) => {
+    for (const packet of packets) {
+        if (packet.data instanceof ArrayBuffer || ArrayBuffer.isView(packet.data)) {
+            return true;
+        }
+    }
+    return false;
+};
+/**
+ * Packet types.
+ */
+exports.packets = {
+    open: 0 // non-ws
+    ,
+    close: 1 // non-ws
+    ,
+    ping: 2,
+    pong: 3,
+    message: 4,
+    upgrade: 5,
+    noop: 6
+};
+var packetslist = Object.keys(exports.packets);
+/**
+ * Premade error packet.
+ */
+var err = { type: 'error', data: 'parser error' };
+const EMPTY_BUFFER = Buffer.concat([]);
+/**
+ * Encodes a packet.
+ *
+ *     <packet type id> [ <data> ]
+ *
+ * Example:
+ *
+ *     5hello world
+ *     3
+ *     4
+ *
+ * Binary is encoded in an identical principle
+ *
+ * @api private
+ */
+function encodePacket(packet, supportsBinary, utf8encode, callback) {
+    if (typeof supportsBinary === 'function') {
+        callback = supportsBinary;
+        supportsBinary = null;
+    }
+    if (typeof utf8encode === 'function') {
+        callback = utf8encode;
+        utf8encode = null;
+    }
+    if (Buffer.isBuffer(packet.data)) {
+        return encodeBuffer(packet, supportsBinary, callback);
+    }
+    else if (packet.data && (packet.data.buffer || packet.data) instanceof ArrayBuffer) {
+        return encodeBuffer({ type: packet.type, data: arrayBufferToBuffer(packet.data) }, supportsBinary, callback);
+    }
+    // Sending data as a utf-8 string
+    var encoded = exports.packets[packet.type];
+    // data fragment is optional
+    if (undefined !== packet.data) {
+        encoded += utf8encode ? utf8.encode(String(packet.data), { strict: false }) : String(packet.data);
+    }
+    return callback('' + encoded);
+}
+/**
+ * Encode Buffer data
+ */
+function encodeBuffer(packet, supportsBinary, callback) {
+    if (!supportsBinary) {
+        return encodeBase64Packet(packet, callback);
+    }
+    var data = packet.data;
+    var typeBuffer = Buffer.allocUnsafe(1);
+    typeBuffer[0] = exports.packets[packet.type];
+    return callback(Buffer.concat([typeBuffer, data]));
+}
+/**
+ * Encodes a packet with binary data in a base64 string
+ *
+ * @param {Object} packet, has `type` and `data`
+ * @return {String} base64 encoded message
+ */
+function encodeBase64Packet(packet, callback) {
+    var data = Buffer.isBuffer(packet.data) ? packet.data : arrayBufferToBuffer(packet.data);
+    var message = 'b' + exports.packets[packet.type];
+    message += data.toString('base64');
+    return callback(message);
+}
+;
+/**
+ * Decodes a packet. Data also available as an ArrayBuffer if requested.
+ *
+ * @return {import('engine.io-parser').Packet} with `type` and `data` (if any)
+ * @api private
+ */
+function decodePacket(data, binaryType, utf8decode) {
+    if (data === undefined) {
+        return err;
+    }
+    let type;
+    // String data
+    if (typeof data === 'string') {
+        type = data.charAt(0);
+        if (type === 'b') {
+            return decodeBase64Packet(data.slice(1), binaryType);
+        }
+        if (utf8decode) {
+            data = tryDecode(data);
+            if (data === false) {
+                return err;
+            }
+        }
+        // @ts-expect-error
+        if (Number(type) != type || !packetslist[type]) {
+            return err;
+        }
+        if (data.length > 1) {
+            return { type: packetslist[type], data: data.slice(1) };
+        }
+        else {
+            return { type: packetslist[type] };
+        }
+    }
+    // Binary data
+    if (binaryType === 'arraybuffer') {
+        // wrap Buffer/ArrayBuffer data into an Uint8Array
+        var intArray = new Uint8Array(data);
+        type = intArray[0];
+        return { type: packetslist[type], data: intArray.buffer.slice(1) };
+    }
+    if (data instanceof ArrayBuffer) {
+        data = arrayBufferToBuffer(data);
+    }
+    type = data[0];
+    return { type: packetslist[type], data: data.slice(1) };
+}
+;
+function tryDecode(data) {
+    try {
+        data = utf8.decode(data, { strict: false });
+    }
+    catch (e) {
+        return false;
+    }
+    return data;
+}
+/**
+ * Decodes a packet encoded in a base64 string.
+ *
+ * @param {String} base64 encoded message
+ * @return {Object} with `type` and `data` (if any)
+ */
+function decodeBase64Packet(msg, binaryType) {
+    var type = packetslist[msg.charAt(0)];
+    var data = Buffer.from(msg.slice(1), 'base64');
+    if (binaryType === 'arraybuffer') {
+        var abv = new Uint8Array(data.length);
+        for (var i = 0; i < abv.length; i++) {
+            abv[i] = data[i];
+        }
+        // @ts-ignore
+        data = abv.buffer;
+    }
+    return { type: type, data: data };
+}
+;
+/**
+ * Encodes multiple messages (payload).
+ *
+ *     <length>:data
+ *
+ * Example:
+ *
+ *     11:hello world2:hi
+ *
+ * If any contents are binary, they will be encoded as base64 strings. Base64
+ * encoded strings are marked with a b before the length specifier
+ *
+ * @param {Array} packets
+ * @api private
+ */
+function encodePayload(packets, supportsBinary, callback) {
+    if (typeof supportsBinary === 'function') {
+        callback = supportsBinary;
+        supportsBinary = null;
+    }
+    if (supportsBinary && hasBinary(packets)) {
+        return encodePayloadAsBinary(packets, callback);
+    }
+    if (!packets.length) {
+        return callback('0:');
+    }
+    function encodeOne(packet, doneCallback) {
+        encodePacket(packet, supportsBinary, false, function (message) {
+            doneCallback(null, setLengthHeader(message));
+        });
+    }
+    map(packets, encodeOne, function (err, results) {
+        return callback(results.join(''));
+    });
+}
+;
+function setLengthHeader(message) {
+    return message.length + ':' + message;
+}
+/**
+ * Async array map using after
+ */
+function map(ary, each, done) {
+    const results = new Array(ary.length);
+    let count = 0;
+    for (let i = 0; i < ary.length; i++) {
+        each(ary[i], (error, msg) => {
+            results[i] = msg;
+            if (++count === ary.length) {
+                done(null, results);
+            }
+        });
+    }
+}
+/*
+ * Decodes data when a payload is maybe expected. Possible binary contents are
+ * decoded from their base64 representation
+ *
+ * @param {String} data, callback method
+ * @api public
+ */
+function decodePayload(data, binaryType, callback) {
+    if (typeof data !== 'string') {
+        return decodePayloadAsBinary(data, binaryType, callback);
+    }
+    if (typeof binaryType === 'function') {
+        callback = binaryType;
+        binaryType = null;
+    }
+    if (data === '') {
+        // parser error - ignoring payload
+        return callback(err, 0, 1);
+    }
+    var length = '', n, msg, packet;
+    for (var i = 0, l = data.length; i < l; i++) {
+        var chr = data.charAt(i);
+        if (chr !== ':') {
+            length += chr;
+            continue;
+        }
+        // @ts-ignore
+        if (length === '' || (length != (n = Number(length)))) {
+            // parser error - ignoring payload
+            return callback(err, 0, 1);
+        }
+        msg = data.slice(i + 1, i + 1 + n);
+        if (length != msg.length) {
+            // parser error - ignoring payload
+            return callback(err, 0, 1);
+        }
+        if (msg.length) {
+            packet = decodePacket(msg, binaryType, false);
+            if (err.type === packet.type && err.data === packet.data) {
+                // parser error in individual packet - ignoring payload
+                return callback(err, 0, 1);
+            }
+            var more = callback(packet, i + n, l);
+            if (false === more)
+                return;
+        }
+        // advance cursor
+        i += n;
+        length = '';
+    }
+    if (length !== '') {
+        // parser error - ignoring payload
+        return callback(err, 0, 1);
+    }
+}
+;
+/**
+ *
+ * Converts a buffer to a utf8.js encoded string
+ *
+ * @api private
+ */
+function bufferToString(buffer) {
+    var str = '';
+    for (var i = 0, l = buffer.length; i < l; i++) {
+        str += String.fromCharCode(buffer[i]);
+    }
+    return str;
+}
+/**
+ *
+ * Converts a utf8.js encoded string to a buffer
+ *
+ * @api private
+ */
+function stringToBuffer(string) {
+    var buf = Buffer.allocUnsafe(string.length);
+    for (var i = 0, l = string.length; i < l; i++) {
+        buf.writeUInt8(string.charCodeAt(i), i);
+    }
+    return buf;
+}
+/**
+ *
+ * Converts an ArrayBuffer to a Buffer
+ *
+ * @api private
+ */
+function arrayBufferToBuffer(data) {
+    // data is either an ArrayBuffer or ArrayBufferView.
+    var length = data.byteLength || data.length;
+    var offset = data.byteOffset || 0;
+    return Buffer.from(data.buffer || data, offset, length);
+}
+/**
+ * Encodes multiple messages (payload) as binary.
+ *
+ * <1 = binary, 0 = string><number from 0-9><number from 0-9>[...]<number
+ * 255><data>
+ *
+ * Example:
+ * 1 3 255 1 2 3, if the binary contents are interpreted as 8 bit integers
+ *
+ * @param {Array} packets
+ * @return {Buffer} encoded payload
+ * @api private
+ */
+function encodePayloadAsBinary(packets, callback) {
+    if (!packets.length) {
+        return callback(EMPTY_BUFFER);
+    }
+    map(packets, encodeOneBinaryPacket, function (err, results) {
+        return callback(Buffer.concat(results));
+    });
+}
+;
+function encodeOneBinaryPacket(p, doneCallback) {
+    function onBinaryPacketEncode(packet) {
+        var encodingLength = '' + packet.length;
+        var sizeBuffer;
+        if (typeof packet === 'string') {
+            sizeBuffer = Buffer.allocUnsafe(encodingLength.length + 2);
+            sizeBuffer[0] = 0; // is a string (not true binary = 0)
+            for (var i = 0; i < encodingLength.length; i++) {
+                sizeBuffer[i + 1] = parseInt(encodingLength[i], 10);
+            }
+            sizeBuffer[sizeBuffer.length - 1] = 255;
+            return doneCallback(null, Buffer.concat([sizeBuffer, stringToBuffer(packet)]));
+        }
+        sizeBuffer = Buffer.allocUnsafe(encodingLength.length + 2);
+        sizeBuffer[0] = 1; // is binary (true binary = 1)
+        for (var i = 0; i < encodingLength.length; i++) {
+            sizeBuffer[i + 1] = parseInt(encodingLength[i], 10);
+        }
+        sizeBuffer[sizeBuffer.length - 1] = 255;
+        doneCallback(null, Buffer.concat([sizeBuffer, packet]));
+    }
+    encodePacket(p, true, true, onBinaryPacketEncode);
+}
+/*
+ * Decodes data when a payload is maybe expected. Strings are decoded by
+ * interpreting each byte as a key code for entries marked to start with 0. See
+ * description of encodePayloadAsBinary
+
+ * @param {Buffer} data, callback method
+ * @api public
+ */
+function decodePayloadAsBinary(data, binaryType, callback) {
+    if (typeof binaryType === 'function') {
+        callback = binaryType;
+        binaryType = null;
+    }
+    var bufferTail = data;
+    var buffers = [];
+    var i;
+    while (bufferTail.length > 0) {
+        var strLen = '';
+        var isString = bufferTail[0] === 0;
+        for (i = 1;; i++) {
+            if (bufferTail[i] === 255)
+                break;
+            // 310 = char length of Number.MAX_VALUE
+            if (strLen.length > 310) {
+                return callback(err, 0, 1);
+            }
+            strLen += '' + bufferTail[i];
+        }
+        bufferTail = bufferTail.slice(strLen.length + 1);
+        var msgLength = parseInt(strLen, 10);
+        var msg = bufferTail.slice(1, msgLength + 1);
+        if (isString)
+            msg = bufferToString(msg);
+        buffers.push(msg);
+        bufferTail = bufferTail.slice(msgLength + 1);
+    }
+    var total = buffers.length;
+    for (i = 0; i < total; i++) {
+        var buffer = buffers[i];
+        callback(decodePacket(buffer, binaryType, true), i, total);
+    }
+}
+;

node_modules/engine.io/build/parser-v3/utf8.d.ts

@@ -0,0 +1,14 @@
+/*! https://mths.be/utf8js v2.1.2 by @mathias */
+declare var stringFromCharCode: (...codes: number[]) => string;
+declare function ucs2decode(string: any): any[];
+declare function ucs2encode(array: any): string;
+declare function checkScalarValue(codePoint: any, strict: any): boolean;
+declare function createByte(codePoint: any, shift: any): string;
+declare function encodeCodePoint(codePoint: any, strict: any): string;
+declare function utf8encode(string: any, opts: any): string;
+declare function readContinuationByte(): number;
+declare function decodeSymbol(strict: any): any;
+declare var byteArray: any;
+declare var byteCount: any;
+declare var byteIndex: any;
+declare function utf8decode(byteString: any, opts: any): string;

node_modules/engine.io/build/parser-v3/utf8.js

@@ -0,0 +1,187 @@
+/*! https://mths.be/utf8js v2.1.2 by @mathias */
+var stringFromCharCode = String.fromCharCode;
+// Taken from https://mths.be/punycode
+function ucs2decode(string) {
+    var output = [];
+    var counter = 0;
+    var length = string.length;
+    var value;
+    var extra;
+    while (counter < length) {
+        value = string.charCodeAt(counter++);
+        if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
+            // high surrogate, and there is a next character
+            extra = string.charCodeAt(counter++);
+            if ((extra & 0xFC00) == 0xDC00) { // low surrogate
+                output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
+            }
+            else {
+                // unmatched surrogate; only append this code unit, in case the next
+                // code unit is the high surrogate of a surrogate pair
+                output.push(value);
+                counter--;
+            }
+        }
+        else {
+            output.push(value);
+        }
+    }
+    return output;
+}
+// Taken from https://mths.be/punycode
+function ucs2encode(array) {
+    var length = array.length;
+    var index = -1;
+    var value;
+    var output = '';
+    while (++index < length) {
+        value = array[index];
+        if (value > 0xFFFF) {
+            value -= 0x10000;
+            output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
+            value = 0xDC00 | value & 0x3FF;
+        }
+        output += stringFromCharCode(value);
+    }
+    return output;
+}
+function checkScalarValue(codePoint, strict) {
+    if (codePoint >= 0xD800 && codePoint <= 0xDFFF) {
+        if (strict) {
+            throw Error('Lone surrogate U+' + codePoint.toString(16).toUpperCase() +
+                ' is not a scalar value');
+        }
+        return false;
+    }
+    return true;
+}
+/*--------------------------------------------------------------------------*/
+function createByte(codePoint, shift) {
+    return stringFromCharCode(((codePoint >> shift) & 0x3F) | 0x80);
+}
+function encodeCodePoint(codePoint, strict) {
+    if ((codePoint & 0xFFFFFF80) == 0) { // 1-byte sequence
+        return stringFromCharCode(codePoint);
+    }
+    var symbol = '';
+    if ((codePoint & 0xFFFFF800) == 0) { // 2-byte sequence
+        symbol = stringFromCharCode(((codePoint >> 6) & 0x1F) | 0xC0);
+    }
+    else if ((codePoint & 0xFFFF0000) == 0) { // 3-byte sequence
+        if (!checkScalarValue(codePoint, strict)) {
+            codePoint = 0xFFFD;
+        }
+        symbol = stringFromCharCode(((codePoint >> 12) & 0x0F) | 0xE0);
+        symbol += createByte(codePoint, 6);
+    }
+    else if ((codePoint & 0xFFE00000) == 0) { // 4-byte sequence
+        symbol = stringFromCharCode(((codePoint >> 18) & 0x07) | 0xF0);
+        symbol += createByte(codePoint, 12);
+        symbol += createByte(codePoint, 6);
+    }
+    symbol += stringFromCharCode((codePoint & 0x3F) | 0x80);
+    return symbol;
+}
+function utf8encode(string, opts) {
+    opts = opts || {};
+    var strict = false !== opts.strict;
+    var codePoints = ucs2decode(string);
+    var length = codePoints.length;
+    var index = -1;
+    var codePoint;
+    var byteString = '';
+    while (++index < length) {
+        codePoint = codePoints[index];
+        byteString += encodeCodePoint(codePoint, strict);
+    }
+    return byteString;
+}
+/*--------------------------------------------------------------------------*/
+function readContinuationByte() {
+    if (byteIndex >= byteCount) {
+        throw Error('Invalid byte index');
+    }
+    var continuationByte = byteArray[byteIndex] & 0xFF;
+    byteIndex++;
+    if ((continuationByte & 0xC0) == 0x80) {
+        return continuationByte & 0x3F;
+    }
+    // If we end up here, it’s not a continuation byte
+    throw Error('Invalid continuation byte');
+}
+function decodeSymbol(strict) {
+    var byte1;
+    var byte2;
+    var byte3;
+    var byte4;
+    var codePoint;
+    if (byteIndex > byteCount) {
+        throw Error('Invalid byte index');
+    }
+    if (byteIndex == byteCount) {
+        return false;
+    }
+    // Read first byte
+    byte1 = byteArray[byteIndex] & 0xFF;
+    byteIndex++;
+    // 1-byte sequence (no continuation bytes)
+    if ((byte1 & 0x80) == 0) {
+        return byte1;
+    }
+    // 2-byte sequence
+    if ((byte1 & 0xE0) == 0xC0) {
+        byte2 = readContinuationByte();
+        codePoint = ((byte1 & 0x1F) << 6) | byte2;
+        if (codePoint >= 0x80) {
+            return codePoint;
+        }
+        else {
+            throw Error('Invalid continuation byte');
+        }
+    }
+    // 3-byte sequence (may include unpaired surrogates)
+    if ((byte1 & 0xF0) == 0xE0) {
+        byte2 = readContinuationByte();
+        byte3 = readContinuationByte();
+        codePoint = ((byte1 & 0x0F) << 12) | (byte2 << 6) | byte3;
+        if (codePoint >= 0x0800) {
+            return checkScalarValue(codePoint, strict) ? codePoint : 0xFFFD;
+        }
+        else {
+            throw Error('Invalid continuation byte');
+        }
+    }
+    // 4-byte sequence
+    if ((byte1 & 0xF8) == 0xF0) {
+        byte2 = readContinuationByte();
+        byte3 = readContinuationByte();
+        byte4 = readContinuationByte();
+        codePoint = ((byte1 & 0x07) << 0x12) | (byte2 << 0x0C) |
+            (byte3 << 0x06) | byte4;
+        if (codePoint >= 0x010000 && codePoint <= 0x10FFFF) {
+            return codePoint;
+        }
+    }
+    throw Error('Invalid UTF-8 detected');
+}
+var byteArray;
+var byteCount;
+var byteIndex;
+function utf8decode(byteString, opts) {
+    opts = opts || {};
+    var strict = false !== opts.strict;
+    byteArray = ucs2decode(byteString);
+    byteCount = byteArray.length;
+    byteIndex = 0;
+    var codePoints = [];
+    var tmp;
+    while ((tmp = decodeSymbol(strict)) !== false) {
+        codePoints.push(tmp);
+    }
+    return ucs2encode(codePoints);
+}
+module.exports = {
+    version: '2.1.2',
+    encode: utf8encode,
+    decode: utf8decode
+};

node_modules/engine.io/build/server.d.ts

@@ -0,0 +1,272 @@
+import { EventEmitter } from "events";
+import { Socket } from "./socket";
+import { type PerMessageDeflateOptions } from "ws";
+import type { IncomingMessage, Server as HttpServer, ServerResponse } from "http";
+import type { CorsOptions, CorsOptionsDelegate } from "cors";
+import type { Duplex } from "stream";
+import type { EngineRequest, Transport } from "./transport";
+import type { CookieSerializeOptions } from "./contrib/types.cookie";
+type TransportName = "polling" | "websocket" | "webtransport";
+export type ErrorCallback = (errorCode?: (typeof Server.errors)[keyof typeof Server.errors], errorContext?: Record<string, unknown> & {
+    name?: string;
+    message?: string;
+}) => void;
+export interface AttachOptions {
+    /**
+     * name of the path to capture
+     * @default "/engine.io"
+     */
+    path?: string;
+    /**
+     * destroy unhandled upgrade requests
+     * @default true
+     */
+    destroyUpgrade?: boolean;
+    /**
+     * milliseconds after which unhandled requests are ended
+     * @default 1000
+     */
+    destroyUpgradeTimeout?: number;
+    /**
+     * Whether we should add a trailing slash to the request path.
+     * @default true
+     */
+    addTrailingSlash?: boolean;
+}
+export interface ServerOptions {
+    /**
+     * how many ms without a pong packet to consider the connection closed
+     * @default 20000
+     */
+    pingTimeout?: number;
+    /**
+     * how many ms before sending a new ping packet
+     * @default 25000
+     */
+    pingInterval?: number;
+    /**
+     * how many ms before an uncompleted transport upgrade is cancelled
+     * @default 10000
+     */
+    upgradeTimeout?: number;
+    /**
+     * how many bytes or characters a message can be, before closing the session (to avoid DoS).
+     * @default 1e5 (100 KB)
+     */
+    maxHttpBufferSize?: number;
+    /**
+     * A function that receives a given handshake or upgrade request as its first parameter,
+     * and can decide whether to continue or not. The second argument is a function that needs
+     * to be called with the decided information: fn(err, success), where success is a boolean
+     * value where false means that the request is rejected, and err is an error code.
+     */
+    allowRequest?: (req: IncomingMessage, fn: (err: string | null | undefined, success: boolean) => void) => void;
+    /**
+     * The low-level transports that are enabled. WebTransport is disabled by default and must be manually enabled:
+     *
+     * @example
+     * new Server({
+     *   transports: ["polling", "websocket", "webtransport"]
+     * });
+     *
+     * @default ["polling", "websocket"]
+     */
+    transports?: TransportName[];
+    /**
+     * whether to allow transport upgrades
+     * @default true
+     */
+    allowUpgrades?: boolean;
+    /**
+     * parameters of the WebSocket permessage-deflate extension (see ws module api docs). Set to false to disable.
+     * @default false
+     */
+    perMessageDeflate?: boolean | PerMessageDeflateOptions;
+    /**
+     * parameters of the http compression for the polling transports (see zlib api docs). Set to false to disable.
+     * @default true
+     */
+    httpCompression?: boolean | object;
+    /**
+     * what WebSocket server implementation to use. Specified module must
+     * conform to the ws interface (see ws module api docs).
+     * An alternative c++ addon is also available by installing eiows module.
+     *
+     * @default `require("ws").Server`
+     */
+    wsEngine?: any;
+    /**
+     * an optional packet which will be concatenated to the handshake packet emitted by Engine.IO.
+     */
+    initialPacket?: any;
+    /**
+     * configuration of the cookie that contains the client sid to send as part of handshake response headers. This cookie
+     * might be used for sticky-session. Defaults to not sending any cookie.
+     * @default false
+     */
+    cookie?: (CookieSerializeOptions & {
+        name: string;
+    }) | boolean;
+    /**
+     * the options that will be forwarded to the cors module
+     */
+    cors?: CorsOptions | CorsOptionsDelegate;
+    /**
+     * whether to enable compatibility with Socket.IO v2 clients
+     * @default false
+     */
+    allowEIO3?: boolean;
+}
+/**
+ * An Express-compatible middleware.
+ *
+ * Middleware functions are functions that have access to the request object (req), the response object (res), and the
+ * next middleware function in the application’s request-response cycle.
+ *
+ * @see https://expressjs.com/en/guide/using-middleware.html
+ */
+type Middleware = (req: IncomingMessage, res: ServerResponse, next: (err?: any) => void) => void;
+export declare abstract class BaseServer extends EventEmitter {
+    opts: ServerOptions;
+    protected clients: Record<string, Socket>;
+    clientsCount: number;
+    protected middlewares: Middleware[];
+    /**
+     * Server constructor.
+     *
+     * @param {Object} opts - options
+     */
+    constructor(opts?: ServerOptions);
+    protected abstract init(): void;
+    /**
+     * Compute the pathname of the requests that are handled by the server
+     * @param options
+     * @protected
+     */
+    protected _computePath(options: AttachOptions): string;
+    /**
+     * Returns a list of available transports for upgrade given a certain transport.
+     */
+    upgrades(transport: TransportName): string[];
+    /**
+     * Verifies a request.
+     *
+     * @param {EngineRequest} req
+     * @param upgrade - whether it's an upgrade request
+     * @param fn
+     * @protected
+     * @return whether the request is valid
+     */
+    protected verify(req: EngineRequest, upgrade: boolean, fn: ErrorCallback): void | boolean;
+    /**
+     * Adds a new middleware.
+     *
+     * @example
+     * import helmet from "helmet";
+     *
+     * engine.use(helmet());
+     *
+     * @param fn
+     */
+    use(fn: any): void;
+    /**
+     * Apply the middlewares to the request.
+     *
+     * @param req
+     * @param res
+     * @param callback
+     * @protected
+     */
+    protected _applyMiddlewares(req: IncomingMessage, res: ServerResponse, callback: (err?: any) => void): void;
+    /**
+     * Closes all clients.
+     */
+    close(): this;
+    protected abstract cleanup(): any;
+    /**
+     * generate a socket id.
+     * Overwrite this method to generate your custom socket id
+     *
+     * @param {IncomingMessage} req - the request object
+     */
+    generateId(req: IncomingMessage): string | PromiseLike<string>;
+    /**
+     * Handshakes a new client.
+     *
+     * @param {String} transportName
+     * @param {Object} req - the request object
+     * @param {Function} closeConnection
+     *
+     * @protected
+     */
+    protected handshake(transportName: TransportName, req: EngineRequest, closeConnection: ErrorCallback): Promise<any>;
+    onWebTransportSession(session: any): Promise<any>;
+    protected abstract createTransport(transportName: TransportName, req: EngineRequest): any;
+    /**
+     * Protocol errors mappings.
+     */
+    static errors: {
+        readonly UNKNOWN_TRANSPORT: 0;
+        readonly UNKNOWN_SID: 1;
+        readonly BAD_HANDSHAKE_METHOD: 2;
+        readonly BAD_REQUEST: 3;
+        readonly FORBIDDEN: 4;
+        readonly UNSUPPORTED_PROTOCOL_VERSION: 5;
+    };
+    static errorMessages: {
+        readonly 0: "Transport unknown";
+        readonly 1: "Session ID unknown";
+        readonly 2: "Bad handshake method";
+        readonly 3: "Bad request";
+        readonly 4: "Forbidden";
+        readonly 5: "Unsupported protocol version";
+    };
+}
+/**
+ * An Engine.IO server based on Node.js built-in HTTP server and the `ws` package for WebSocket connections.
+ */
+export declare class Server extends BaseServer {
+    httpServer?: HttpServer;
+    private ws;
+    /**
+     * Initialize websocket server
+     *
+     * @protected
+     */
+    protected init(): void;
+    protected cleanup(): void;
+    /**
+     * Prepares a request by processing the query string.
+     *
+     * @private
+     */
+    private prepare;
+    protected createTransport(transportName: TransportName, req: IncomingMessage): Transport;
+    /**
+     * Handles an Engine.IO HTTP request.
+     *
+     * @param {EngineRequest} req
+     * @param {ServerResponse} res
+     */
+    handleRequest(req: EngineRequest, res: ServerResponse): void;
+    /**
+     * Handles an Engine.IO HTTP Upgrade.
+     */
+    handleUpgrade(req: EngineRequest, socket: Duplex, upgradeHead: Buffer): void;
+    /**
+     * Called upon a ws.io connection.
+     * @param req
+     * @param socket
+     * @param websocket
+     * @private
+     */
+    private onWebSocket;
+    /**
+     * Captures upgrade requests for a http.Server.
+     *
+     * @param {http.Server} server
+     * @param {Object} options
+     */
+    attach(server: HttpServer, options?: AttachOptions): void;
+}
+export {};

node_modules/engine.io/build/server.js

@@ -0,0 +1,787 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Server = exports.BaseServer = void 0;
+const base64id = require("base64id");
+const transports_1 = require("./transports");
+const events_1 = require("events");
+const socket_1 = require("./socket");
+const debug_1 = require("debug");
+const cookie_1 = require("cookie");
+const ws_1 = require("ws");
+const webtransport_1 = require("./transports/webtransport");
+const engine_io_parser_1 = require("engine.io-parser");
+const debug = (0, debug_1.default)("engine");
+const kResponseHeaders = Symbol("responseHeaders");
+function parseSessionId(data) {
+    try {
+        const parsed = JSON.parse(data);
+        if (typeof parsed.sid === "string") {
+            return parsed.sid;
+        }
+    }
+    catch (e) { }
+}
+class BaseServer extends events_1.EventEmitter {
+    /**
+     * Server constructor.
+     *
+     * @param {Object} opts - options
+     */
+    constructor(opts = {}) {
+        super();
+        this.middlewares = [];
+        this.clients = {};
+        this.clientsCount = 0;
+        this.opts = Object.assign({
+            wsEngine: ws_1.Server,
+            pingTimeout: 20000,
+            pingInterval: 25000,
+            upgradeTimeout: 10000,
+            maxHttpBufferSize: 1e6,
+            transports: ["polling", "websocket"], // WebTransport is disabled by default
+            allowUpgrades: true,
+            httpCompression: {
+                threshold: 1024,
+            },
+            cors: false,
+            allowEIO3: false,
+        }, opts);
+        if (opts.cookie) {
+            this.opts.cookie = Object.assign({
+                name: "io",
+                path: "/",
+                // @ts-ignore
+                httpOnly: opts.cookie.path !== false,
+                sameSite: "lax",
+            }, opts.cookie);
+        }
+        if (this.opts.cors) {
+            this.use(require("cors")(this.opts.cors));
+        }
+        if (opts.perMessageDeflate) {
+            this.opts.perMessageDeflate = Object.assign({
+                threshold: 1024,
+            }, opts.perMessageDeflate);
+        }
+        this.init();
+    }
+    /**
+     * Compute the pathname of the requests that are handled by the server
+     * @param options
+     * @protected
+     */
+    _computePath(options) {
+        let path = (options.path || "/engine.io").replace(/\/$/, "");
+        if (options.addTrailingSlash !== false) {
+            // normalize path
+            path += "/";
+        }
+        return path;
+    }
+    /**
+     * Returns a list of available transports for upgrade given a certain transport.
+     */
+    upgrades(transport) {
+        if (!this.opts.allowUpgrades)
+            return [];
+        return transports_1.default[transport].upgradesTo || [];
+    }
+    /**
+     * Verifies a request.
+     *
+     * @param {EngineRequest} req
+     * @param upgrade - whether it's an upgrade request
+     * @param fn
+     * @protected
+     * @return whether the request is valid
+     */
+    verify(req, upgrade, fn) {
+        // transport check
+        const transport = req._query.transport;
+        // WebTransport does not go through the verify() method, see the onWebTransportSession() method
+        if (!~this.opts.transports.indexOf(transport) ||
+            transport === "webtransport") {
+            debug('unknown transport "%s"', transport);
+            return fn(Server.errors.UNKNOWN_TRANSPORT, { transport });
+        }
+        // 'Origin' header check
+        const isOriginInvalid = checkInvalidHeaderChar(req.headers.origin);
+        if (isOriginInvalid) {
+            const origin = req.headers.origin;
+            req.headers.origin = null;
+            debug("origin header invalid");
+            return fn(Server.errors.BAD_REQUEST, {
+                name: "INVALID_ORIGIN",
+                origin,
+            });
+        }
+        // sid check
+        const sid = req._query.sid;
+        if (sid) {
+            if (!this.clients.hasOwnProperty(sid)) {
+                debug('unknown sid "%s"', sid);
+                return fn(Server.errors.UNKNOWN_SID, {
+                    sid,
+                });
+            }
+            const previousTransport = this.clients[sid].transport.name;
+            if (!upgrade && previousTransport !== transport) {
+                debug("bad request: unexpected transport without upgrade");
+                return fn(Server.errors.BAD_REQUEST, {
+                    name: "TRANSPORT_MISMATCH",
+                    transport,
+                    previousTransport,
+                });
+            }
+        }
+        else {
+            // handshake is GET only
+            if ("GET" !== req.method) {
+                return fn(Server.errors.BAD_HANDSHAKE_METHOD, {
+                    method: req.method,
+                });
+            }
+            if (transport === "websocket" && !upgrade) {
+                debug("invalid transport upgrade");
+                return fn(Server.errors.BAD_REQUEST, {
+                    name: "TRANSPORT_HANDSHAKE_ERROR",
+                });
+            }
+            if (!this.opts.allowRequest)
+                return fn();
+            return this.opts.allowRequest(req, (message, success) => {
+                if (!success) {
+                    return fn(Server.errors.FORBIDDEN, {
+                        message,
+                    });
+                }
+                fn();
+            });
+        }
+        fn();
+    }
+    /**
+     * Adds a new middleware.
+     *
+     * @example
+     * import helmet from "helmet";
+     *
+     * engine.use(helmet());
+     *
+     * @param fn
+     */
+    use(fn) {
+        this.middlewares.push(fn);
+    }
+    /**
+     * Apply the middlewares to the request.
+     *
+     * @param req
+     * @param res
+     * @param callback
+     * @protected
+     */
+    _applyMiddlewares(req, res, callback) {
+        if (this.middlewares.length === 0) {
+            debug("no middleware to apply, skipping");
+            return callback();
+        }
+        const apply = (i) => {
+            debug("applying middleware n°%d", i + 1);
+            this.middlewares[i](req, res, (err) => {
+                if (err) {
+                    return callback(err);
+                }
+                if (i + 1 < this.middlewares.length) {
+                    apply(i + 1);
+                }
+                else {
+                    callback();
+                }
+            });
+        };
+        apply(0);
+    }
+    /**
+     * Closes all clients.
+     */
+    close() {
+        debug("closing all open clients");
+        for (let i in this.clients) {
+            if (this.clients.hasOwnProperty(i)) {
+                this.clients[i].close(true);
+            }
+        }
+        this.cleanup();
+        return this;
+    }
+    /**
+     * generate a socket id.
+     * Overwrite this method to generate your custom socket id
+     *
+     * @param {IncomingMessage} req - the request object
+     */
+    generateId(req) {
+        return base64id.generateId();
+    }
+    /**
+     * Handshakes a new client.
+     *
+     * @param {String} transportName
+     * @param {Object} req - the request object
+     * @param {Function} closeConnection
+     *
+     * @protected
+     */
+    async handshake(transportName, req, closeConnection) {
+        const protocol = req._query.EIO === "4" ? 4 : 3; // 3rd revision by default
+        if (protocol === 3 && !this.opts.allowEIO3) {
+            debug("unsupported protocol version");
+            this.emit("connection_error", {
+                req,
+                code: Server.errors.UNSUPPORTED_PROTOCOL_VERSION,
+                message: Server.errorMessages[Server.errors.UNSUPPORTED_PROTOCOL_VERSION],
+                context: {
+                    protocol,
+                },
+            });
+            closeConnection(Server.errors.UNSUPPORTED_PROTOCOL_VERSION);
+            return;
+        }
+        let id;
+        try {
+            id = await this.generateId(req);
+        }
+        catch (e) {
+            debug("error while generating an id");
+            this.emit("connection_error", {
+                req,
+                code: Server.errors.BAD_REQUEST,
+                message: Server.errorMessages[Server.errors.BAD_REQUEST],
+                context: {
+                    name: "ID_GENERATION_ERROR",
+                    error: e,
+                },
+            });
+            closeConnection(Server.errors.BAD_REQUEST);
+            return;
+        }
+        debug('handshaking client "%s"', id);
+        try {
+            var transport = this.createTransport(transportName, req);
+            if ("polling" === transportName) {
+                transport.maxHttpBufferSize = this.opts.maxHttpBufferSize;
+                transport.httpCompression = this.opts.httpCompression;
+            }
+            else if ("websocket" === transportName) {
+                transport.perMessageDeflate = this.opts.perMessageDeflate;
+            }
+        }
+        catch (e) {
+            debug('error handshaking to transport "%s"', transportName);
+            this.emit("connection_error", {
+                req,
+                code: Server.errors.BAD_REQUEST,
+                message: Server.errorMessages[Server.errors.BAD_REQUEST],
+                context: {
+                    name: "TRANSPORT_HANDSHAKE_ERROR",
+                    error: e,
+                },
+            });
+            closeConnection(Server.errors.BAD_REQUEST);
+            return;
+        }
+        const socket = new socket_1.Socket(id, this, transport, req, protocol);
+        transport.on("headers", (headers, req) => {
+            const isInitialRequest = !req._query.sid;
+            if (isInitialRequest) {
+                if (this.opts.cookie) {
+                    headers["Set-Cookie"] = [
+                        // @ts-ignore
+                        (0, cookie_1.serialize)(this.opts.cookie.name, id, this.opts.cookie),
+                    ];
+                }
+                this.emit("initial_headers", headers, req);
+            }
+            this.emit("headers", headers, req);
+        });
+        transport.onRequest(req);
+        this.clients[id] = socket;
+        this.clientsCount++;
+        socket.once("close", () => {
+            delete this.clients[id];
+            this.clientsCount--;
+        });
+        this.emit("connection", socket);
+        return transport;
+    }
+    async onWebTransportSession(session) {
+        const timeout = setTimeout(() => {
+            debug("the client failed to establish a bidirectional stream in the given period");
+            session.close();
+        }, this.opts.upgradeTimeout);
+        const streamReader = session.incomingBidirectionalStreams.getReader();
+        const result = await streamReader.read();
+        if (result.done) {
+            debug("session is closed");
+            return;
+        }
+        const stream = result.value;
+        const transformStream = (0, engine_io_parser_1.createPacketDecoderStream)(this.opts.maxHttpBufferSize, "nodebuffer");
+        const reader = stream.readable.pipeThrough(transformStream).getReader();
+        // reading the first packet of the stream
+        const { value, done } = await reader.read();
+        if (done) {
+            debug("stream is closed");
+            return;
+        }
+        clearTimeout(timeout);
+        if (value.type !== "open") {
+            debug("invalid WebTransport handshake");
+            return session.close();
+        }
+        if (value.data === undefined) {
+            const transport = new webtransport_1.WebTransport(session, stream, reader);
+            // note: we cannot use "this.generateId()", because there is no "req" argument
+            const id = base64id.generateId();
+            debug('handshaking client "%s" (WebTransport)', id);
+            const socket = new socket_1.Socket(id, this, transport, null, 4);
+            this.clients[id] = socket;
+            this.clientsCount++;
+            socket.once("close", () => {
+                delete this.clients[id];
+                this.clientsCount--;
+            });
+            this.emit("connection", socket);
+            return;
+        }
+        const sid = parseSessionId(value.data);
+        if (!sid) {
+            debug("invalid WebTransport handshake");
+            return session.close();
+        }
+        const client = this.clients[sid];
+        if (!client) {
+            debug("upgrade attempt for closed client");
+            session.close();
+        }
+        else if (client.upgrading) {
+            debug("transport has already been trying to upgrade");
+            session.close();
+        }
+        else if (client.upgraded) {
+            debug("transport had already been upgraded");
+            session.close();
+        }
+        else {
+            debug("upgrading existing transport");
+            const transport = new webtransport_1.WebTransport(session, stream, reader);
+            client._maybeUpgrade(transport);
+        }
+    }
+}
+exports.BaseServer = BaseServer;
+/**
+ * Protocol errors mappings.
+ */
+BaseServer.errors = {
+    UNKNOWN_TRANSPORT: 0,
+    UNKNOWN_SID: 1,
+    BAD_HANDSHAKE_METHOD: 2,
+    BAD_REQUEST: 3,
+    FORBIDDEN: 4,
+    UNSUPPORTED_PROTOCOL_VERSION: 5,
+};
+BaseServer.errorMessages = {
+    0: "Transport unknown",
+    1: "Session ID unknown",
+    2: "Bad handshake method",
+    3: "Bad request",
+    4: "Forbidden",
+    5: "Unsupported protocol version",
+};
+/**
+ * Exposes a subset of the http.ServerResponse interface, in order to be able to apply the middlewares to an upgrade
+ * request.
+ *
+ * @see https://nodejs.org/api/http.html#class-httpserverresponse
+ */
+class WebSocketResponse {
+    constructor(req, socket) {
+        this.req = req;
+        this.socket = socket;
+        // temporarily store the response headers on the req object (see the "headers" event)
+        req[kResponseHeaders] = {};
+    }
+    setHeader(name, value) {
+        this.req[kResponseHeaders][name] = value;
+    }
+    getHeader(name) {
+        return this.req[kResponseHeaders][name];
+    }
+    removeHeader(name) {
+        delete this.req[kResponseHeaders][name];
+    }
+    write() { }
+    writeHead() { }
+    end() {
+        // we could return a proper error code, but the WebSocket client will emit an "error" event anyway.
+        this.socket.destroy();
+    }
+}
+/**
+ * An Engine.IO server based on Node.js built-in HTTP server and the `ws` package for WebSocket connections.
+ */
+class Server extends BaseServer {
+    /**
+     * Initialize websocket server
+     *
+     * @protected
+     */
+    init() {
+        if (!~this.opts.transports.indexOf("websocket"))
+            return;
+        if (this.ws)
+            this.ws.close();
+        this.ws = new this.opts.wsEngine({
+            noServer: true,
+            clientTracking: false,
+            perMessageDeflate: this.opts.perMessageDeflate,
+            maxPayload: this.opts.maxHttpBufferSize,
+        });
+        if (typeof this.ws.on === "function") {
+            this.ws.on("headers", (headersArray, req) => {
+                // note: 'ws' uses an array of headers, while Engine.IO uses an object (response.writeHead() accepts both formats)
+                // we could also try to parse the array and then sync the values, but that will be error-prone
+                const additionalHeaders = req[kResponseHeaders] || {};
+                delete req[kResponseHeaders];
+                const isInitialRequest = !req._query.sid;
+                if (isInitialRequest) {
+                    this.emit("initial_headers", additionalHeaders, req);
+                }
+                this.emit("headers", additionalHeaders, req);
+                debug("writing headers: %j", additionalHeaders);
+                Object.keys(additionalHeaders).forEach((key) => {
+                    headersArray.push(`${key}: ${additionalHeaders[key]}`);
+                });
+            });
+        }
+    }
+    cleanup() {
+        if (this.ws) {
+            debug("closing webSocketServer");
+            this.ws.close();
+            // don't delete this.ws because it can be used again if the http server starts listening again
+        }
+    }
+    /**
+     * Prepares a request by processing the query string.
+     *
+     * @private
+     */
+    prepare(req) {
+        // try to leverage pre-existing `req._query` (e.g: from connect)
+        if (!req._query) {
+            const url = new URL(req.url, "https://socket.io");
+            req._query = Object.fromEntries(url.searchParams.entries());
+        }
+    }
+    createTransport(transportName, req) {
+        // @ts-expect-error 'polling' is a plain function used as constructor
+        return new transports_1.default[transportName](req);
+    }
+    /**
+     * Handles an Engine.IO HTTP request.
+     *
+     * @param {EngineRequest} req
+     * @param {ServerResponse} res
+     */
+    handleRequest(req, res) {
+        debug('handling "%s" http request "%s"', req.method, req.url);
+        this.prepare(req);
+        req.res = res;
+        const callback = (errorCode, errorContext) => {
+            if (errorCode !== undefined) {
+                this.emit("connection_error", {
+                    req,
+                    code: errorCode,
+                    message: Server.errorMessages[errorCode],
+                    context: errorContext,
+                });
+                abortRequest(res, errorCode, errorContext);
+                return;
+            }
+            if (req._query.sid) {
+                debug("setting new request for existing client");
+                this.clients[req._query.sid].transport.onRequest(req);
+            }
+            else {
+                const closeConnection = (errorCode, errorContext) => abortRequest(res, errorCode, errorContext);
+                this.handshake(req._query.transport, req, closeConnection);
+            }
+        };
+        this._applyMiddlewares(req, res, (err) => {
+            if (err) {
+                callback(Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
+            }
+            else {
+                this.verify(req, false, callback);
+            }
+        });
+    }
+    /**
+     * Handles an Engine.IO HTTP Upgrade.
+     */
+    handleUpgrade(req, socket, upgradeHead) {
+        this.prepare(req);
+        const res = new WebSocketResponse(req, socket);
+        const callback = (errorCode, errorContext) => {
+            if (errorCode !== undefined) {
+                this.emit("connection_error", {
+                    req,
+                    code: errorCode,
+                    message: Server.errorMessages[errorCode],
+                    context: errorContext,
+                });
+                abortUpgrade(socket, errorCode, errorContext);
+                return;
+            }
+            const head = Buffer.from(upgradeHead);
+            upgradeHead = null;
+            // some middlewares (like express-session) wait for the writeHead() call to flush their headers
+            // see https://github.com/expressjs/session/blob/1010fadc2f071ddf2add94235d72224cf65159c6/index.js#L220-L244
+            res.writeHead();
+            // delegate to ws
+            this.ws.handleUpgrade(req, socket, head, (websocket) => {
+                this.onWebSocket(req, socket, websocket);
+            });
+        };
+        this._applyMiddlewares(req, res, (err) => {
+            if (err) {
+                callback(Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
+            }
+            else {
+                this.verify(req, true, callback);
+            }
+        });
+    }
+    /**
+     * Called upon a ws.io connection.
+     * @param req
+     * @param socket
+     * @param websocket
+     * @private
+     */
+    onWebSocket(req, socket, websocket) {
+        websocket.on("error", onUpgradeError);
+        if (transports_1.default[req._query.transport] !== undefined &&
+            !transports_1.default[req._query.transport].prototype.handlesUpgrades) {
+            debug("transport doesnt handle upgraded requests");
+            websocket.close();
+            return;
+        }
+        // get client id
+        const id = req._query.sid;
+        // keep a reference to the ws.Socket
+        req.websocket = websocket;
+        if (id) {
+            const client = this.clients[id];
+            if (!client) {
+                debug("upgrade attempt for closed client");
+                websocket.close();
+            }
+            else if (client.upgrading) {
+                debug("transport has already been trying to upgrade");
+                websocket.close();
+            }
+            else if (client.upgraded) {
+                debug("transport had already been upgraded");
+                websocket.close();
+            }
+            else {
+                debug("upgrading existing transport");
+                // transport error handling takes over
+                websocket.removeListener("error", onUpgradeError);
+                const transport = this.createTransport(req._query.transport, req);
+                // @ts-expect-error this option is only for WebSocket impl
+                transport.perMessageDeflate = this.opts.perMessageDeflate;
+                client._maybeUpgrade(transport);
+            }
+        }
+        else {
+            const closeConnection = (errorCode, errorContext) => abortUpgrade(socket, errorCode, errorContext);
+            this.handshake(req._query.transport, req, closeConnection);
+        }
+        function onUpgradeError() {
+            debug("websocket error before upgrade");
+            // websocket.close() not needed
+        }
+    }
+    /**
+     * Captures upgrade requests for a http.Server.
+     *
+     * @param {http.Server} server
+     * @param {Object} options
+     */
+    attach(server, options = {}) {
+        const path = this._computePath(options);
+        const destroyUpgradeTimeout = options.destroyUpgradeTimeout || 1000;
+        function check(req) {
+            // TODO use `path === new URL(...).pathname` in the next major release (ref: https://nodejs.org/api/url.html)
+            return path === req.url.slice(0, path.length);
+        }
+        // cache and clean up listeners
+        const listeners = server.listeners("request").slice(0);
+        server.removeAllListeners("request");
+        server.on("close", this.close.bind(this));
+        server.on("listening", this.init.bind(this));
+        // add request handler
+        server.on("request", (req, res) => {
+            if (check(req)) {
+                debug('intercepting request for path "%s"', path);
+                this.handleRequest(req, res);
+            }
+            else {
+                let i = 0;
+                const l = listeners.length;
+                for (; i < l; i++) {
+                    listeners[i].call(server, req, res);
+                }
+            }
+        });
+        if (~this.opts.transports.indexOf("websocket")) {
+            server.on("upgrade", (req, socket, head) => {
+                if (check(req)) {
+                    this.handleUpgrade(req, socket, head);
+                }
+                else if (false !== options.destroyUpgrade) {
+                    // default node behavior is to disconnect when no handlers
+                    // but by adding a handler, we prevent that
+                    // and if no eio thing handles the upgrade
+                    // then the socket needs to die!
+                    setTimeout(function () {
+                        // @ts-ignore
+                        if (socket.writable && socket.bytesWritten <= 0) {
+                            socket.on("error", (e) => {
+                                debug("error while destroying upgrade: %s", e.message);
+                            });
+                            return socket.end();
+                        }
+                    }, destroyUpgradeTimeout);
+                }
+            });
+        }
+    }
+}
+exports.Server = Server;
+/**
+ * Close the HTTP long-polling request
+ *
+ * @param res - the response object
+ * @param errorCode - the error code
+ * @param errorContext - additional error context
+ *
+ * @private
+ */
+function abortRequest(res, errorCode, errorContext) {
+    const statusCode = errorCode === Server.errors.FORBIDDEN ? 403 : 400;
+    const message = errorContext && errorContext.message
+        ? errorContext.message
+        : Server.errorMessages[errorCode];
+    res.writeHead(statusCode, { "Content-Type": "application/json" });
+    res.end(JSON.stringify({
+        code: errorCode,
+        message,
+    }));
+}
+/**
+ * Close the WebSocket connection
+ *
+ * @param {net.Socket} socket
+ * @param {string} errorCode - the error code
+ * @param {object} errorContext - additional error context
+ */
+function abortUpgrade(socket, errorCode, errorContext = {}) {
+    socket.on("error", () => {
+        debug("ignoring error from closed connection");
+    });
+    if (socket.writable) {
+        const message = errorContext.message || Server.errorMessages[errorCode];
+        const length = Buffer.byteLength(message);
+        socket.write("HTTP/1.1 400 Bad Request\r\n" +
+            "Connection: close\r\n" +
+            "Content-type: text/html\r\n" +
+            "Content-Length: " +
+            length +
+            "\r\n" +
+            "\r\n" +
+            message);
+    }
+    socket.destroy();
+}
+/* eslint-disable */
+/**
+ * From https://github.com/nodejs/node/blob/v8.4.0/lib/_http_common.js#L303-L354
+ *
+ * True if val contains an invalid field-vchar
+ *  field-value    = *( field-content / obs-fold )
+ *  field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
+ *  field-vchar    = VCHAR / obs-text
+ *
+ * checkInvalidHeaderChar() is currently designed to be inlinable by v8,
+ * so take care when making changes to the implementation so that the source
+ * code size does not exceed v8's default max_inlined_source_size setting.
+ **/
+// prettier-ignore
+const validHdrChars = [
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, // 0 - 15
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 32 - 47
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 48 - 63
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 80 - 95
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, // 112 - 127
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 128 ...
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 // ... 255
+];
+function checkInvalidHeaderChar(val) {
+    val += "";
+    if (val.length < 1)
+        return false;
+    if (!validHdrChars[val.charCodeAt(0)]) {
+        debug('invalid header, index 0, char "%s"', val.charCodeAt(0));
+        return true;
+    }
+    if (val.length < 2)
+        return false;
+    if (!validHdrChars[val.charCodeAt(1)]) {
+        debug('invalid header, index 1, char "%s"', val.charCodeAt(1));
+        return true;
+    }
+    if (val.length < 3)
+        return false;
+    if (!validHdrChars[val.charCodeAt(2)]) {
+        debug('invalid header, index 2, char "%s"', val.charCodeAt(2));
+        return true;
+    }
+    if (val.length < 4)
+        return false;
+    if (!validHdrChars[val.charCodeAt(3)]) {
+        debug('invalid header, index 3, char "%s"', val.charCodeAt(3));
+        return true;
+    }
+    for (let i = 4; i < val.length; ++i) {
+        if (!validHdrChars[val.charCodeAt(i)]) {
+            debug('invalid header, index "%i", char "%s"', i, val.charCodeAt(i));
+            return true;
+        }
+    }
+    return false;
+}

node_modules/engine.io/build/socket.d.ts

@@ -0,0 +1,180 @@
+import { EventEmitter } from "events";
+import type { IncomingMessage } from "http";
+import type { EngineRequest, Transport } from "./transport";
+import type { BaseServer } from "./server";
+import type { RawData } from "engine.io-parser";
+export interface SendOptions {
+    compress?: boolean;
+}
+type ReadyState = "opening" | "open" | "closing" | "closed";
+type SendCallback = (transport: Transport) => void;
+export declare class Socket extends EventEmitter {
+    /**
+     * The revision of the protocol:
+     *
+     * - 3rd is used in Engine.IO v3 / Socket.IO v2
+     * - 4th is used in Engine.IO v4 and above / Socket.IO v3 and above
+     *
+     * It is found in the `EIO` query parameters of the HTTP requests.
+     *
+     * @see https://github.com/socketio/engine.io-protocol
+     */
+    readonly protocol: number;
+    /**
+     * A reference to the first HTTP request of the session
+     *
+     * TODO for the next major release: remove it
+     */
+    request: IncomingMessage;
+    /**
+     * The IP address of the client.
+     */
+    readonly remoteAddress: string;
+    /**
+     * The current state of the socket.
+     */
+    _readyState: ReadyState;
+    /**
+     * The current low-level transport.
+     */
+    transport: Transport;
+    private server;
+    upgrading: boolean;
+    upgraded: boolean;
+    private writeBuffer;
+    private packetsFn;
+    private sentCallbackFn;
+    private cleanupFn;
+    private pingTimeoutTimer;
+    private pingIntervalTimer;
+    /**
+     * This is the session identifier that the client will use in the subsequent HTTP requests. It must not be shared with
+     * others parties, as it might lead to session hijacking.
+     *
+     * @private
+     */
+    private readonly id;
+    get readyState(): ReadyState;
+    set readyState(state: ReadyState);
+    constructor(id: string, server: BaseServer, transport: Transport, req: EngineRequest, protocol: number);
+    /**
+     * Called upon transport considered open.
+     *
+     * @private
+     */
+    private onOpen;
+    /**
+     * Called upon transport packet.
+     *
+     * @param {Object} packet
+     * @private
+     */
+    private onPacket;
+    /**
+     * Called upon transport error.
+     *
+     * @param {Error} err - error object
+     * @private
+     */
+    private onError;
+    /**
+     * Pings client every `this.pingInterval` and expects response
+     * within `this.pingTimeout` or closes connection.
+     *
+     * @private
+     */
+    private schedulePing;
+    /**
+     * Resets ping timeout.
+     *
+     * @private
+     */
+    private resetPingTimeout;
+    /**
+     * Attaches handlers for the given transport.
+     *
+     * @param {Transport} transport
+     * @private
+     */
+    private setTransport;
+    /**
+     * Upon transport "drain" event
+     *
+     * @private
+     */
+    private onDrain;
+    /**
+     * Upgrades socket to the given transport
+     *
+     * @param {Transport} transport
+     * @private
+     */
+    _maybeUpgrade(transport: Transport): void;
+    /**
+     * Clears listeners and timers associated with current transport.
+     *
+     * @private
+     */
+    private clearTransport;
+    /**
+     * Called upon transport considered closed.
+     * Possible reasons: `ping timeout`, `client error`, `parse error`,
+     * `transport error`, `server close`, `transport close`
+     */
+    private onClose;
+    /**
+     * Sends a message packet.
+     *
+     * @param {Object} data
+     * @param {Object} options
+     * @param {Function} callback
+     * @return {Socket} for chaining
+     */
+    send(data: RawData, options?: SendOptions, callback?: SendCallback): this;
+    /**
+     * Alias of {@link send}.
+     *
+     * @param data
+     * @param options
+     * @param callback
+     */
+    write(data: RawData, options?: SendOptions, callback?: SendCallback): this;
+    /**
+     * Sends a packet.
+     *
+     * @param {String} type - packet type
+     * @param {String} data
+     * @param {Object} options
+     * @param {Function} callback
+     *
+     * @private
+     */
+    private sendPacket;
+    /**
+     * Attempts to flush the packets buffer.
+     *
+     * @private
+     */
+    private flush;
+    /**
+     * Get available upgrades for this socket.
+     *
+     * @private
+     */
+    private getAvailableUpgrades;
+    /**
+     * Closes the socket and underlying transport.
+     *
+     * @param {Boolean} discard - optional, discard the transport
+     * @return {Socket} for chaining
+     */
+    close(discard?: boolean): void;
+    /**
+     * Closes the underlying transport.
+     *
+     * @param {Boolean} discard
+     * @private
+     */
+    private closeTransport;
+}
+export {};

node_modules/engine.io/build/socket.js

@@ -0,0 +1,460 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Socket = void 0;
+const events_1 = require("events");
+const debug_1 = require("debug");
+const timers_1 = require("timers");
+const debug = (0, debug_1.default)("engine:socket");
+class Socket extends events_1.EventEmitter {
+    get readyState() {
+        return this._readyState;
+    }
+    set readyState(state) {
+        debug("readyState updated from %s to %s", this._readyState, state);
+        this._readyState = state;
+    }
+    constructor(id, server, transport, req, protocol) {
+        super();
+        /**
+         * The current state of the socket.
+         */
+        this._readyState = "opening";
+        /* private */ this.upgrading = false;
+        /* private */ this.upgraded = false;
+        this.writeBuffer = [];
+        this.packetsFn = [];
+        this.sentCallbackFn = [];
+        this.cleanupFn = [];
+        this.id = id;
+        this.server = server;
+        this.request = req;
+        this.protocol = protocol;
+        // Cache IP since it might not be in the req later
+        if (req) {
+            if (req.websocket && req.websocket._socket) {
+                this.remoteAddress = req.websocket._socket.remoteAddress;
+            }
+            else {
+                this.remoteAddress = req.connection.remoteAddress;
+            }
+        }
+        else {
+            // TODO there is currently no way to get the IP address of the client when it connects with WebTransport
+            //  see https://github.com/fails-components/webtransport/issues/114
+        }
+        this.pingTimeoutTimer = null;
+        this.pingIntervalTimer = null;
+        this.setTransport(transport);
+        this.onOpen();
+    }
+    /**
+     * Called upon transport considered open.
+     *
+     * @private
+     */
+    onOpen() {
+        this.readyState = "open";
+        // sends an `open` packet
+        this.transport.sid = this.id;
+        this.sendPacket("open", JSON.stringify({
+            sid: this.id,
+            upgrades: this.getAvailableUpgrades(),
+            pingInterval: this.server.opts.pingInterval,
+            pingTimeout: this.server.opts.pingTimeout,
+            maxPayload: this.server.opts.maxHttpBufferSize,
+        }));
+        if (this.server.opts.initialPacket) {
+            this.sendPacket("message", this.server.opts.initialPacket);
+        }
+        this.emit("open");
+        if (this.protocol === 3) {
+            // in protocol v3, the client sends a ping, and the server answers with a pong
+            this.resetPingTimeout();
+        }
+        else {
+            // in protocol v4, the server sends a ping, and the client answers with a pong
+            this.schedulePing();
+        }
+    }
+    /**
+     * Called upon transport packet.
+     *
+     * @param {Object} packet
+     * @private
+     */
+    onPacket(packet) {
+        if ("open" !== this.readyState) {
+            return debug("packet received with closed socket");
+        }
+        // export packet event
+        debug(`received packet ${packet.type}`);
+        this.emit("packet", packet);
+        switch (packet.type) {
+            case "ping":
+                if (this.transport.protocol !== 3) {
+                    this.onError(new Error("invalid heartbeat direction"));
+                    return;
+                }
+                debug("got ping");
+                this.pingTimeoutTimer.refresh();
+                this.sendPacket("pong");
+                this.emit("heartbeat");
+                break;
+            case "pong":
+                if (this.transport.protocol === 3) {
+                    this.onError(new Error("invalid heartbeat direction"));
+                    return;
+                }
+                debug("got pong");
+                (0, timers_1.clearTimeout)(this.pingTimeoutTimer);
+                this.pingIntervalTimer.refresh();
+                this.emit("heartbeat");
+                break;
+            case "error":
+                this.onClose("parse error");
+                break;
+            case "message":
+                this.emit("data", packet.data);
+                this.emit("message", packet.data);
+                break;
+        }
+    }
+    /**
+     * Called upon transport error.
+     *
+     * @param {Error} err - error object
+     * @private
+     */
+    onError(err) {
+        debug("transport error");
+        this.onClose("transport error", err);
+    }
+    /**
+     * Pings client every `this.pingInterval` and expects response
+     * within `this.pingTimeout` or closes connection.
+     *
+     * @private
+     */
+    schedulePing() {
+        this.pingIntervalTimer = (0, timers_1.setTimeout)(() => {
+            debug("writing ping packet - expecting pong within %sms", this.server.opts.pingTimeout);
+            this.sendPacket("ping");
+            this.resetPingTimeout();
+        }, this.server.opts.pingInterval);
+    }
+    /**
+     * Resets ping timeout.
+     *
+     * @private
+     */
+    resetPingTimeout() {
+        (0, timers_1.clearTimeout)(this.pingTimeoutTimer);
+        this.pingTimeoutTimer = (0, timers_1.setTimeout)(() => {
+            if (this.readyState === "closed")
+                return;
+            this.onClose("ping timeout");
+        }, this.protocol === 3
+            ? this.server.opts.pingInterval + this.server.opts.pingTimeout
+            : this.server.opts.pingTimeout);
+    }
+    /**
+     * Attaches handlers for the given transport.
+     *
+     * @param {Transport} transport
+     * @private
+     */
+    setTransport(transport) {
+        const onError = this.onError.bind(this);
+        const onReady = () => this.flush();
+        const onPacket = this.onPacket.bind(this);
+        const onDrain = this.onDrain.bind(this);
+        const onClose = this.onClose.bind(this, "transport close");
+        this.transport = transport;
+        this.transport.once("error", onError);
+        this.transport.on("ready", onReady);
+        this.transport.on("packet", onPacket);
+        this.transport.on("drain", onDrain);
+        this.transport.once("close", onClose);
+        this.cleanupFn.push(function () {
+            transport.removeListener("error", onError);
+            transport.removeListener("ready", onReady);
+            transport.removeListener("packet", onPacket);
+            transport.removeListener("drain", onDrain);
+            transport.removeListener("close", onClose);
+        });
+    }
+    /**
+     * Upon transport "drain" event
+     *
+     * @private
+     */
+    onDrain() {
+        if (this.sentCallbackFn.length > 0) {
+            debug("executing batch send callback");
+            const seqFn = this.sentCallbackFn.shift();
+            if (seqFn) {
+                for (let i = 0; i < seqFn.length; i++) {
+                    seqFn[i](this.transport);
+                }
+            }
+        }
+    }
+    /**
+     * Upgrades socket to the given transport
+     *
+     * @param {Transport} transport
+     * @private
+     */
+    /* private */ _maybeUpgrade(transport) {
+        debug('might upgrade socket transport from "%s" to "%s"', this.transport.name, transport.name);
+        this.upgrading = true;
+        // set transport upgrade timer
+        const upgradeTimeoutTimer = (0, timers_1.setTimeout)(() => {
+            debug("client did not complete upgrade - closing transport");
+            cleanup();
+            if ("open" === transport.readyState) {
+                transport.close();
+            }
+        }, this.server.opts.upgradeTimeout);
+        let checkIntervalTimer;
+        const onPacket = (packet) => {
+            if ("ping" === packet.type && "probe" === packet.data) {
+                debug("got probe ping packet, sending pong");
+                transport.send([{ type: "pong", data: "probe" }]);
+                this.emit("upgrading", transport);
+                clearInterval(checkIntervalTimer);
+                checkIntervalTimer = setInterval(check, 100);
+            }
+            else if ("upgrade" === packet.type && this.readyState !== "closed") {
+                debug("got upgrade packet - upgrading");
+                cleanup();
+                this.transport.discard();
+                this.upgraded = true;
+                this.clearTransport();
+                this.setTransport(transport);
+                this.emit("upgrade", transport);
+                this.flush();
+                if (this.readyState === "closing") {
+                    transport.close(() => {
+                        this.onClose("forced close");
+                    });
+                }
+            }
+            else {
+                cleanup();
+                transport.close();
+            }
+        };
+        // we force a polling cycle to ensure a fast upgrade
+        const check = () => {
+            if ("polling" === this.transport.name && this.transport.writable) {
+                debug("writing a noop packet to polling for fast upgrade");
+                this.transport.send([{ type: "noop" }]);
+            }
+        };
+        const cleanup = () => {
+            this.upgrading = false;
+            clearInterval(checkIntervalTimer);
+            (0, timers_1.clearTimeout)(upgradeTimeoutTimer);
+            transport.removeListener("packet", onPacket);
+            transport.removeListener("close", onTransportClose);
+            transport.removeListener("error", onError);
+            this.removeListener("close", onClose);
+        };
+        const onError = (err) => {
+            debug("client did not complete upgrade - %s", err);
+            cleanup();
+            transport.close();
+            transport = null;
+        };
+        const onTransportClose = () => {
+            onError("transport closed");
+        };
+        const onClose = () => {
+            onError("socket closed");
+        };
+        transport.on("packet", onPacket);
+        transport.once("close", onTransportClose);
+        transport.once("error", onError);
+        this.once("close", onClose);
+    }
+    /**
+     * Clears listeners and timers associated with current transport.
+     *
+     * @private
+     */
+    clearTransport() {
+        let cleanup;
+        const toCleanUp = this.cleanupFn.length;
+        for (let i = 0; i < toCleanUp; i++) {
+            cleanup = this.cleanupFn.shift();
+            cleanup();
+        }
+        // silence further transport errors and prevent uncaught exceptions
+        this.transport.on("error", function () {
+            debug("error triggered by discarded transport");
+        });
+        // ensure transport won't stay open
+        this.transport.close();
+        (0, timers_1.clearTimeout)(this.pingTimeoutTimer);
+    }
+    /**
+     * Called upon transport considered closed.
+     * Possible reasons: `ping timeout`, `client error`, `parse error`,
+     * `transport error`, `server close`, `transport close`
+     */
+    onClose(reason, description) {
+        if ("closed" !== this.readyState) {
+            this.readyState = "closed";
+            // clear timers
+            (0, timers_1.clearTimeout)(this.pingIntervalTimer);
+            (0, timers_1.clearTimeout)(this.pingTimeoutTimer);
+            // clean writeBuffer in next tick, so developers can still
+            // grab the writeBuffer on 'close' event
+            process.nextTick(() => {
+                this.writeBuffer = [];
+            });
+            this.packetsFn = [];
+            this.sentCallbackFn = [];
+            this.clearTransport();
+            this.emit("close", reason, description);
+        }
+    }
+    /**
+     * Sends a message packet.
+     *
+     * @param {Object} data
+     * @param {Object} options
+     * @param {Function} callback
+     * @return {Socket} for chaining
+     */
+    send(data, options, callback) {
+        this.sendPacket("message", data, options, callback);
+        return this;
+    }
+    /**
+     * Alias of {@link send}.
+     *
+     * @param data
+     * @param options
+     * @param callback
+     */
+    write(data, options, callback) {
+        this.sendPacket("message", data, options, callback);
+        return this;
+    }
+    /**
+     * Sends a packet.
+     *
+     * @param {String} type - packet type
+     * @param {String} data
+     * @param {Object} options
+     * @param {Function} callback
+     *
+     * @private
+     */
+    sendPacket(type, data, options = {}, callback) {
+        if ("function" === typeof options) {
+            callback = options;
+            options = {};
+        }
+        if ("closing" !== this.readyState && "closed" !== this.readyState) {
+            debug('sending packet "%s" (%s)', type, data);
+            // compression is enabled by default
+            options.compress = options.compress !== false;
+            const packet = {
+                type,
+                options: options,
+            };
+            if (data)
+                packet.data = data;
+            // exports packetCreate event
+            this.emit("packetCreate", packet);
+            this.writeBuffer.push(packet);
+            // add send callback to object, if defined
+            if ("function" === typeof callback)
+                this.packetsFn.push(callback);
+            this.flush();
+        }
+    }
+    /**
+     * Attempts to flush the packets buffer.
+     *
+     * @private
+     */
+    flush() {
+        if ("closed" !== this.readyState &&
+            this.transport.writable &&
+            this.writeBuffer.length) {
+            debug("flushing buffer to transport");
+            this.emit("flush", this.writeBuffer);
+            this.server.emit("flush", this, this.writeBuffer);
+            const wbuf = this.writeBuffer;
+            this.writeBuffer = [];
+            if (this.packetsFn.length) {
+                this.sentCallbackFn.push(this.packetsFn);
+                this.packetsFn = [];
+            }
+            else {
+                this.sentCallbackFn.push(null);
+            }
+            this.transport.send(wbuf);
+            this.emit("drain");
+            this.server.emit("drain", this);
+        }
+    }
+    /**
+     * Get available upgrades for this socket.
+     *
+     * @private
+     */
+    getAvailableUpgrades() {
+        const availableUpgrades = [];
+        const allUpgrades = this.server.upgrades(this.transport.name);
+        for (let i = 0; i < allUpgrades.length; ++i) {
+            const upg = allUpgrades[i];
+            if (this.server.opts.transports.indexOf(upg) !== -1) {
+                availableUpgrades.push(upg);
+            }
+        }
+        return availableUpgrades;
+    }
+    /**
+     * Closes the socket and underlying transport.
+     *
+     * @param {Boolean} discard - optional, discard the transport
+     * @return {Socket} for chaining
+     */
+    close(discard) {
+        if (discard &&
+            (this.readyState === "open" || this.readyState === "closing")) {
+            return this.closeTransport(discard);
+        }
+        if ("open" !== this.readyState)
+            return;
+        this.readyState = "closing";
+        if (this.writeBuffer.length) {
+            debug("there are %d remaining packets in the buffer, waiting for the 'drain' event", this.writeBuffer.length);
+            this.once("drain", () => {
+                debug("all packets have been sent, closing the transport");
+                this.closeTransport(discard);
+            });
+            return;
+        }
+        debug("the buffer is empty, closing the transport right away");
+        this.closeTransport(discard);
+    }
+    /**
+     * Closes the underlying transport.
+     *
+     * @param {Boolean} discard
+     * @private
+     */
+    closeTransport(discard) {
+        debug("closing the transport (discard? %s)", !!discard);
+        if (discard)
+            this.transport.discard();
+        this.transport.close(this.onClose.bind(this, "forced close"));
+    }
+}
+exports.Socket = Socket;

node_modules/engine.io/build/transport.d.ts

@@ -0,0 +1,135 @@
+import { EventEmitter } from "events";
+import * as parser_v4 from "engine.io-parser";
+import * as parser_v3 from "./parser-v3/index";
+import type { IncomingMessage, ServerResponse } from "http";
+import { Packet, RawData } from "engine.io-parser";
+import type { WebSocket } from "ws";
+type ReadyState = "open" | "closing" | "closed";
+export type EngineRequest = IncomingMessage & {
+    _query: Record<string, string>;
+    res?: ServerResponse;
+    cleanup?: Function;
+    websocket?: WebSocket & {
+        _socket?: {
+            remoteAddress: string;
+        };
+    };
+};
+export declare abstract class Transport extends EventEmitter {
+    /**
+     * The session ID.
+     */
+    sid: string;
+    /**
+     * Whether the transport is currently ready to send packets.
+     */
+    writable: boolean;
+    /**
+     * The revision of the protocol:
+     *
+     * - 3 is used in Engine.IO v3 / Socket.IO v2
+     * - 4 is used in Engine.IO v4 and above / Socket.IO v3 and above
+     *
+     * It is found in the `EIO` query parameters of the HTTP requests.
+     *
+     * @see https://github.com/socketio/engine.io-protocol
+     */
+    protocol: 3 | 4;
+    /**
+     * The current state of the transport.
+     * @protected
+     */
+    protected _readyState: ReadyState;
+    /**
+     * Whether the transport is discarded and can be safely closed (used during upgrade).
+     * @protected
+     */
+    protected discarded: boolean;
+    /**
+     * The parser to use (depends on the revision of the {@link Transport#protocol}.
+     * @protected
+     */
+    protected parser: typeof parser_v4 | typeof parser_v3;
+    /**
+     * Whether the transport supports binary payloads (else it will be base64-encoded)
+     * @protected
+     */
+    protected supportsBinary: boolean;
+    get readyState(): ReadyState;
+    set readyState(state: ReadyState);
+    /**
+     * The list of transports this transport can be upgraded to.
+     */
+    static upgradesTo: string[];
+    /**
+     * Transport constructor.
+     *
+     * @param {EngineRequest} req
+     */
+    constructor(req: {
+        _query: Record<string, string>;
+    });
+    /**
+     * Flags the transport as discarded.
+     *
+     * @package
+     */
+    discard(): void;
+    /**
+     * Called with an incoming HTTP request.
+     *
+     * @param req
+     * @package
+     */
+    onRequest(req: any): void;
+    /**
+     * Closes the transport.
+     *
+     * @package
+     */
+    close(fn?: () => void): void;
+    /**
+     * Called with a transport error.
+     *
+     * @param {String} msg - message error
+     * @param {Object} desc - error description
+     * @protected
+     */
+    protected onError(msg: string, desc?: any): void;
+    /**
+     * Called with parsed out a packets from the data stream.
+     *
+     * @param {Object} packet
+     * @protected
+     */
+    protected onPacket(packet: Packet): void;
+    /**
+     * Called with the encoded packet data.
+     *
+     * @param data
+     * @protected
+     */
+    protected onData(data: RawData): void;
+    /**
+     * Called upon transport close.
+     *
+     * @protected
+     */
+    protected onClose(): void;
+    /**
+     * The name of the transport.
+     */
+    abstract get name(): string;
+    /**
+     * Sends an array of packets.
+     *
+     * @param {Array} packets
+     * @package
+     */
+    abstract send(packets: Packet[]): void;
+    /**
+     * Closes the transport.
+     */
+    abstract doClose(fn?: () => void): void;
+}
+export {};

node_modules/engine.io/build/transport.js

@@ -0,0 +1,121 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Transport = void 0;
+const events_1 = require("events");
+const parser_v4 = require("engine.io-parser");
+const parser_v3 = require("./parser-v3/index");
+const debug_1 = require("debug");
+const debug = (0, debug_1.default)("engine:transport");
+function noop() { }
+class Transport extends events_1.EventEmitter {
+    get readyState() {
+        return this._readyState;
+    }
+    set readyState(state) {
+        debug("readyState updated from %s to %s (%s)", this._readyState, state, this.name);
+        this._readyState = state;
+    }
+    /**
+     * Transport constructor.
+     *
+     * @param {EngineRequest} req
+     */
+    constructor(req) {
+        super();
+        /**
+         * Whether the transport is currently ready to send packets.
+         */
+        this.writable = false;
+        /**
+         * The current state of the transport.
+         * @protected
+         */
+        this._readyState = "open";
+        /**
+         * Whether the transport is discarded and can be safely closed (used during upgrade).
+         * @protected
+         */
+        this.discarded = false;
+        this.protocol = req._query.EIO === "4" ? 4 : 3; // 3rd revision by default
+        this.parser = this.protocol === 4 ? parser_v4 : parser_v3;
+        this.supportsBinary = !(req._query && req._query.b64);
+    }
+    /**
+     * Flags the transport as discarded.
+     *
+     * @package
+     */
+    discard() {
+        this.discarded = true;
+    }
+    /**
+     * Called with an incoming HTTP request.
+     *
+     * @param req
+     * @package
+     */
+    onRequest(req) { }
+    /**
+     * Closes the transport.
+     *
+     * @package
+     */
+    close(fn) {
+        if ("closed" === this.readyState || "closing" === this.readyState)
+            return;
+        this.readyState = "closing";
+        this.doClose(fn || noop);
+    }
+    /**
+     * Called with a transport error.
+     *
+     * @param {String} msg - message error
+     * @param {Object} desc - error description
+     * @protected
+     */
+    onError(msg, desc) {
+        if (this.listeners("error").length) {
+            const err = new Error(msg);
+            // @ts-ignore
+            err.type = "TransportError";
+            // @ts-ignore
+            err.description = desc;
+            this.emit("error", err);
+        }
+        else {
+            debug("ignored transport error %s (%s)", msg, desc);
+        }
+    }
+    /**
+     * Called with parsed out a packets from the data stream.
+     *
+     * @param {Object} packet
+     * @protected
+     */
+    onPacket(packet) {
+        this.emit("packet", packet);
+    }
+    /**
+     * Called with the encoded packet data.
+     *
+     * @param data
+     * @protected
+     */
+    onData(data) {
+        this.onPacket(this.parser.decodePacket(data));
+    }
+    /**
+     * Called upon transport close.
+     *
+     * @protected
+     */
+    onClose() {
+        this.readyState = "closed";
+        this.emit("close");
+    }
+}
+exports.Transport = Transport;
+/**
+ * The list of transports this transport can be upgraded to.
+ */
+Transport.upgradesTo = [];

node_modules/engine.io/build/transports-uws/index.d.ts

@@ -0,0 +1,7 @@
+import { Polling } from "./polling";
+import { WebSocket } from "./websocket";
+declare const _default: {
+    polling: typeof Polling;
+    websocket: typeof WebSocket;
+};
+export default _default;

node_modules/engine.io/build/transports-uws/index.js

@@ -0,0 +1,8 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const polling_1 = require("./polling");
+const websocket_1 = require("./websocket");
+exports.default = {
+    polling: polling_1.Polling,
+    websocket: websocket_1.WebSocket,
+};

node_modules/engine.io/build/transports-uws/polling.d.ts

@@ -0,0 +1,99 @@
+import { Transport } from "../transport";
+export declare class Polling extends Transport {
+    maxHttpBufferSize: number;
+    httpCompression: any;
+    private req;
+    private res;
+    private dataReq;
+    private dataRes;
+    private shouldClose;
+    private readonly closeTimeout;
+    /**
+     * HTTP polling constructor.
+     */
+    constructor(req: any);
+    /**
+     * Transport name
+     */
+    get name(): string;
+    /**
+     * Overrides onRequest.
+     *
+     * @param req
+     *
+     * @private
+     */
+    onRequest(req: any): void;
+    /**
+     * The client sends a request awaiting for us to send data.
+     *
+     * @private
+     */
+    onPollRequest(req: any, res: any): void;
+    /**
+     * The client sends a request with data.
+     *
+     * @private
+     */
+    onDataRequest(req: any, res: any): void;
+    /**
+     * Cleanup request.
+     *
+     * @private
+     */
+    private onDataRequestCleanup;
+    /**
+     * Processes the incoming data payload.
+     *
+     * @param {String} encoded payload
+     * @private
+     */
+    onData(data: any): void;
+    /**
+     * Overrides onClose.
+     *
+     * @private
+     */
+    onClose(): void;
+    /**
+     * Writes a packet payload.
+     *
+     * @param {Object} packet
+     * @private
+     */
+    send(packets: any): void;
+    /**
+     * Writes data as response to poll request.
+     *
+     * @param {String} data
+     * @param {Object} options
+     * @private
+     */
+    write(data: any, options: any): void;
+    /**
+     * Performs the write.
+     *
+     * @private
+     */
+    doWrite(data: any, options: any, callback: any): void;
+    /**
+     * Compresses data.
+     *
+     * @private
+     */
+    compress(data: any, encoding: any, callback: any): void;
+    /**
+     * Closes the transport.
+     *
+     * @private
+     */
+    doClose(fn: any): void;
+    /**
+     * Returns headers for a response.
+     *
+     * @param req - request
+     * @param {Object} extra headers
+     * @private
+     */
+    headers(req: any, headers: any): any;
+}

node_modules/engine.io/build/transports-uws/polling.js

@@ -0,0 +1,364 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Polling = void 0;
+const transport_1 = require("../transport");
+const zlib_1 = require("zlib");
+const accepts = require("accepts");
+const debug_1 = require("debug");
+const debug = (0, debug_1.default)("engine:polling");
+const compressionMethods = {
+    gzip: zlib_1.createGzip,
+    deflate: zlib_1.createDeflate,
+};
+class Polling extends transport_1.Transport {
+    /**
+     * HTTP polling constructor.
+     */
+    constructor(req) {
+        super(req);
+        this.closeTimeout = 30 * 1000;
+    }
+    /**
+     * Transport name
+     */
+    get name() {
+        return "polling";
+    }
+    /**
+     * Overrides onRequest.
+     *
+     * @param req
+     *
+     * @private
+     */
+    onRequest(req) {
+        const res = req.res;
+        // remove the reference to the ServerResponse object (as the first request of the session is kept in memory by default)
+        req.res = null;
+        if (req.getMethod() === "get") {
+            this.onPollRequest(req, res);
+        }
+        else if (req.getMethod() === "post") {
+            this.onDataRequest(req, res);
+        }
+        else {
+            res.writeStatus("500 Internal Server Error");
+            res.end();
+        }
+    }
+    /**
+     * The client sends a request awaiting for us to send data.
+     *
+     * @private
+     */
+    onPollRequest(req, res) {
+        if (this.req) {
+            debug("request overlap");
+            // assert: this.res, '.req and .res should be (un)set together'
+            this.onError("overlap from client");
+            res.writeStatus("500 Internal Server Error");
+            res.end();
+            return;
+        }
+        debug("setting request");
+        this.req = req;
+        this.res = res;
+        const onClose = () => {
+            this.writable = false;
+            this.onError("poll connection closed prematurely");
+        };
+        const cleanup = () => {
+            this.req = this.res = null;
+        };
+        req.cleanup = cleanup;
+        res.onAborted(onClose);
+        this.writable = true;
+        this.emit("ready");
+        // if we're still writable but had a pending close, trigger an empty send
+        if (this.writable && this.shouldClose) {
+            debug("triggering empty send to append close packet");
+            this.send([{ type: "noop" }]);
+        }
+    }
+    /**
+     * The client sends a request with data.
+     *
+     * @private
+     */
+    onDataRequest(req, res) {
+        if (this.dataReq) {
+            // assert: this.dataRes, '.dataReq and .dataRes should be (un)set together'
+            this.onError("data request overlap from client");
+            res.writeStatus("500 Internal Server Error");
+            res.end();
+            return;
+        }
+        const expectedContentLength = Number(req.headers["content-length"]);
+        if (!expectedContentLength) {
+            this.onError("content-length header required");
+            res.writeStatus("411 Length Required").end();
+            return;
+        }
+        if (expectedContentLength > this.maxHttpBufferSize) {
+            this.onError("payload too large");
+            res.writeStatus("413 Payload Too Large").end();
+            return;
+        }
+        const isBinary = "application/octet-stream" === req.headers["content-type"];
+        if (isBinary && this.protocol === 4) {
+            return this.onError("invalid content");
+        }
+        this.dataReq = req;
+        this.dataRes = res;
+        let buffer;
+        let offset = 0;
+        const headers = {
+            // text/html is required instead of text/plain to avoid an
+            // unwanted download dialog on certain user-agents (GH-43)
+            "Content-Type": "text/html",
+        };
+        this.headers(req, headers);
+        for (let key in headers) {
+            res.writeHeader(key, String(headers[key]));
+        }
+        const onEnd = (buffer) => {
+            this.onData(buffer.toString());
+            this.onDataRequestCleanup();
+            res.cork(() => {
+                res.end("ok");
+            });
+        };
+        res.onAborted(() => {
+            this.onDataRequestCleanup();
+            this.onError("data request connection closed prematurely");
+        });
+        res.onData((arrayBuffer, isLast) => {
+            const totalLength = offset + arrayBuffer.byteLength;
+            if (totalLength > expectedContentLength) {
+                this.onError("content-length mismatch");
+                res.close(); // calls onAborted
+                return;
+            }
+            if (!buffer) {
+                if (isLast) {
+                    onEnd(Buffer.from(arrayBuffer));
+                    return;
+                }
+                buffer = Buffer.allocUnsafe(expectedContentLength);
+            }
+            Buffer.from(arrayBuffer).copy(buffer, offset);
+            if (isLast) {
+                if (totalLength != expectedContentLength) {
+                    this.onError("content-length mismatch");
+                    res.writeStatus("400 Content-Length Mismatch").end();
+                    this.onDataRequestCleanup();
+                    return;
+                }
+                onEnd(buffer);
+                return;
+            }
+            offset = totalLength;
+        });
+    }
+    /**
+     * Cleanup request.
+     *
+     * @private
+     */
+    onDataRequestCleanup() {
+        this.dataReq = this.dataRes = null;
+    }
+    /**
+     * Processes the incoming data payload.
+     *
+     * @param {String} encoded payload
+     * @private
+     */
+    onData(data) {
+        debug('received "%s"', data);
+        const callback = (packet) => {
+            if ("close" === packet.type) {
+                debug("got xhr close packet");
+                this.onClose();
+                return false;
+            }
+            this.onPacket(packet);
+        };
+        if (this.protocol === 3) {
+            this.parser.decodePayload(data, callback);
+        }
+        else {
+            this.parser.decodePayload(data).forEach(callback);
+        }
+    }
+    /**
+     * Overrides onClose.
+     *
+     * @private
+     */
+    onClose() {
+        if (this.writable) {
+            // close pending poll request
+            this.send([{ type: "noop" }]);
+        }
+        super.onClose();
+    }
+    /**
+     * Writes a packet payload.
+     *
+     * @param {Object} packet
+     * @private
+     */
+    send(packets) {
+        this.writable = false;
+        if (this.shouldClose) {
+            debug("appending close packet to payload");
+            packets.push({ type: "close" });
+            this.shouldClose();
+            this.shouldClose = null;
+        }
+        const doWrite = (data) => {
+            const compress = packets.some((packet) => {
+                return packet.options && packet.options.compress;
+            });
+            this.write(data, { compress });
+        };
+        if (this.protocol === 3) {
+            this.parser.encodePayload(packets, this.supportsBinary, doWrite);
+        }
+        else {
+            this.parser.encodePayload(packets, doWrite);
+        }
+    }
+    /**
+     * Writes data as response to poll request.
+     *
+     * @param {String} data
+     * @param {Object} options
+     * @private
+     */
+    write(data, options) {
+        debug('writing "%s"', data);
+        this.doWrite(data, options, () => {
+            this.req.cleanup();
+            this.emit("drain");
+        });
+    }
+    /**
+     * Performs the write.
+     *
+     * @private
+     */
+    doWrite(data, options, callback) {
+        // explicit UTF-8 is required for pages not served under utf
+        const isString = typeof data === "string";
+        const contentType = isString
+            ? "text/plain; charset=UTF-8"
+            : "application/octet-stream";
+        const headers = {
+            "Content-Type": contentType,
+        };
+        const respond = (data) => {
+            this.headers(this.req, headers);
+            this.res.cork(() => {
+                Object.keys(headers).forEach((key) => {
+                    this.res.writeHeader(key, String(headers[key]));
+                });
+                this.res.end(data);
+            });
+            callback();
+        };
+        if (!this.httpCompression || !options.compress) {
+            respond(data);
+            return;
+        }
+        const len = isString ? Buffer.byteLength(data) : data.length;
+        if (len < this.httpCompression.threshold) {
+            respond(data);
+            return;
+        }
+        const encoding = accepts(this.req).encodings(["gzip", "deflate"]);
+        if (!encoding) {
+            respond(data);
+            return;
+        }
+        this.compress(data, encoding, (err, data) => {
+            if (err) {
+                this.res.writeStatus("500 Internal Server Error");
+                this.res.end();
+                callback(err);
+                return;
+            }
+            headers["Content-Encoding"] = encoding;
+            respond(data);
+        });
+    }
+    /**
+     * Compresses data.
+     *
+     * @private
+     */
+    compress(data, encoding, callback) {
+        debug("compressing");
+        const buffers = [];
+        let nread = 0;
+        compressionMethods[encoding](this.httpCompression)
+            .on("error", callback)
+            .on("data", function (chunk) {
+            buffers.push(chunk);
+            nread += chunk.length;
+        })
+            .on("end", function () {
+            callback(null, Buffer.concat(buffers, nread));
+        })
+            .end(data);
+    }
+    /**
+     * Closes the transport.
+     *
+     * @private
+     */
+    doClose(fn) {
+        debug("closing");
+        let closeTimeoutTimer;
+        const onClose = () => {
+            clearTimeout(closeTimeoutTimer);
+            fn();
+            this.onClose();
+        };
+        if (this.writable) {
+            debug("transport writable - closing right away");
+            this.send([{ type: "close" }]);
+            onClose();
+        }
+        else if (this.discarded) {
+            debug("transport discarded - closing right away");
+            onClose();
+        }
+        else {
+            debug("transport not writable - buffering orderly close");
+            this.shouldClose = onClose;
+            closeTimeoutTimer = setTimeout(onClose, this.closeTimeout);
+        }
+    }
+    /**
+     * Returns headers for a response.
+     *
+     * @param req - request
+     * @param {Object} extra headers
+     * @private
+     */
+    headers(req, headers) {
+        headers = headers || {};
+        // prevent XSS warnings on IE
+        // https://github.com/LearnBoost/socket.io/pull/1333
+        const ua = req.headers["user-agent"];
+        if (ua && (~ua.indexOf(";MSIE") || ~ua.indexOf("Trident/"))) {
+            headers["X-XSS-Protection"] = "0";
+        }
+        headers["cache-control"] = "no-store";
+        this.emit("headers", headers, req);
+        return headers;
+    }
+}
+exports.Polling = Polling;

node_modules/engine.io/build/transports-uws/websocket.d.ts

@@ -0,0 +1,32 @@
+import { Transport } from "../transport";
+export declare class WebSocket extends Transport {
+    protected perMessageDeflate: any;
+    private socket;
+    /**
+     * WebSocket transport
+     *
+     * @param req
+     */
+    constructor(req: any);
+    /**
+     * Transport name
+     */
+    get name(): string;
+    /**
+     * Advertise upgrade support.
+     */
+    get handlesUpgrades(): boolean;
+    /**
+     * Writes a packet payload.
+     *
+     * @param {Array} packets
+     * @private
+     */
+    send(packets: any): void;
+    /**
+     * Closes the transport.
+     *
+     * @private
+     */
+    doClose(fn: any): void;
+}

node_modules/engine.io/build/transports-uws/websocket.js

@@ -0,0 +1,73 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.WebSocket = void 0;
+const transport_1 = require("../transport");
+const debug_1 = require("debug");
+const debug = (0, debug_1.default)("engine:ws");
+class WebSocket extends transport_1.Transport {
+    /**
+     * WebSocket transport
+     *
+     * @param req
+     */
+    constructor(req) {
+        super(req);
+        this.writable = false;
+        this.perMessageDeflate = null;
+    }
+    /**
+     * Transport name
+     */
+    get name() {
+        return "websocket";
+    }
+    /**
+     * Advertise upgrade support.
+     */
+    get handlesUpgrades() {
+        return true;
+    }
+    /**
+     * Writes a packet payload.
+     *
+     * @param {Array} packets
+     * @private
+     */
+    send(packets) {
+        this.writable = false;
+        for (let i = 0; i < packets.length; i++) {
+            const packet = packets[i];
+            const isLast = i + 1 === packets.length;
+            const send = (data) => {
+                const isBinary = typeof data !== "string";
+                const compress = this.perMessageDeflate &&
+                    Buffer.byteLength(data) > this.perMessageDeflate.threshold;
+                debug('writing "%s"', data);
+                this.socket.send(data, isBinary, compress);
+                if (isLast) {
+                    this.emit("drain");
+                    this.writable = true;
+                    this.emit("ready");
+                }
+            };
+            if (packet.options && typeof packet.options.wsPreEncoded === "string") {
+                send(packet.options.wsPreEncoded);
+            }
+            else {
+                this.parser.encodePacket(packet, this.supportsBinary, send);
+            }
+        }
+    }
+    /**
+     * Closes the transport.
+     *
+     * @private
+     */
+    doClose(fn) {
+        debug("closing");
+        fn && fn();
+        // call fn first since socket.end() immediately emits a "close" event
+        this.socket.end();
+    }
+}
+exports.WebSocket = WebSocket;

node_modules/engine.io/build/transports/index.d.ts

@@ -0,0 +1,17 @@
+import { Polling as XHR } from "./polling";
+import { WebSocket } from "./websocket";
+import { WebTransport } from "./webtransport";
+import type { EngineRequest } from "../transport";
+declare const _default: {
+    polling: typeof polling;
+    websocket: typeof WebSocket;
+    webtransport: typeof WebTransport;
+};
+export default _default;
+/**
+ * Polling polymorphic constructor.
+ */
+declare function polling(req: EngineRequest): XHR;
+declare namespace polling {
+    var upgradesTo: string[];
+}

node_modules/engine.io/build/transports/index.js

@@ -0,0 +1,23 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const polling_1 = require("./polling");
+const polling_jsonp_1 = require("./polling-jsonp");
+const websocket_1 = require("./websocket");
+const webtransport_1 = require("./webtransport");
+exports.default = {
+    polling,
+    websocket: websocket_1.WebSocket,
+    webtransport: webtransport_1.WebTransport,
+};
+/**
+ * Polling polymorphic constructor.
+ */
+function polling(req) {
+    if ("string" === typeof req._query.j) {
+        return new polling_jsonp_1.JSONP(req);
+    }
+    else {
+        return new polling_1.Polling(req);
+    }
+}
+polling.upgradesTo = ["websocket", "webtransport"];

node_modules/engine.io/build/transports/polling-jsonp.d.ts

@@ -0,0 +1,12 @@
+import { Polling } from "./polling";
+import type { RawData } from "engine.io-parser";
+export declare class JSONP extends Polling {
+    private readonly head;
+    private readonly foot;
+    /**
+     * JSON-P polling transport.
+     */
+    constructor(req: any);
+    onData(data: RawData): void;
+    doWrite(data: any, options: any, callback: any): void;
+}

node_modules/engine.io/build/transports/polling-jsonp.js

@@ -0,0 +1,41 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.JSONP = void 0;
+const polling_1 = require("./polling");
+const qs = require("querystring");
+const rDoubleSlashes = /\\\\n/g;
+const rSlashes = /(\\)?\\n/g;
+class JSONP extends polling_1.Polling {
+    /**
+     * JSON-P polling transport.
+     */
+    constructor(req) {
+        super(req);
+        this.head = "___eio[" + (req._query.j || "").replace(/[^0-9]/g, "") + "](";
+        this.foot = ");";
+    }
+    onData(data) {
+        // we leverage the qs module so that we get built-in DoS protection
+        // and the fast alternative to decodeURIComponent
+        data = qs.parse(data).d;
+        if ("string" === typeof data) {
+            // client will send already escaped newlines as \\\\n and newlines as \\n
+            // \\n must be replaced with \n and \\\\n with \\n
+            data = data.replace(rSlashes, function (match, slashes) {
+                return slashes ? match : "\n";
+            });
+            super.onData(data.replace(rDoubleSlashes, "\\n"));
+        }
+    }
+    doWrite(data, options, callback) {
+        // we must output valid javascript, not valid json
+        // see: http://timelessrepo.com/json-isnt-a-javascript-subset
+        const js = JSON.stringify(data)
+            .replace(/\u2028/g, "\\u2028")
+            .replace(/\u2029/g, "\\u2029");
+        // prepare response
+        data = this.head + js + this.foot;
+        super.doWrite(data, options, callback);
+    }
+}
+exports.JSONP = JSONP;

node_modules/engine.io/build/transports/polling.d.ts

@@ -0,0 +1,87 @@
+import { EngineRequest, Transport } from "../transport";
+import type { Packet, RawData } from "engine.io-parser";
+export declare class Polling extends Transport {
+    maxHttpBufferSize: number;
+    httpCompression: any;
+    private req;
+    private res;
+    private dataReq;
+    private dataRes;
+    private shouldClose;
+    private readonly closeTimeout;
+    /**
+     * HTTP polling constructor.
+     */
+    constructor(req: any);
+    /**
+     * Transport name
+     */
+    get name(): string;
+    /**
+     * Overrides onRequest.
+     *
+     * @param {EngineRequest} req
+     * @package
+     */
+    onRequest(req: EngineRequest): void;
+    /**
+     * The client sends a request awaiting for us to send data.
+     *
+     * @private
+     */
+    private onPollRequest;
+    /**
+     * The client sends a request with data.
+     *
+     * @private
+     */
+    private onDataRequest;
+    /**
+     * Processes the incoming data payload.
+     *
+     * @param data - encoded payload
+     * @protected
+     */
+    onData(data: RawData): void;
+    /**
+     * Overrides onClose.
+     *
+     * @private
+     */
+    onClose(): void;
+    send(packets: Packet[]): void;
+    /**
+     * Writes data as response to poll request.
+     *
+     * @param {String} data
+     * @param {Object} options
+     * @private
+     */
+    private write;
+    /**
+     * Performs the write.
+     *
+     * @protected
+     */
+    protected doWrite(data: any, options: any, callback: any): void;
+    /**
+     * Compresses data.
+     *
+     * @private
+     */
+    private compress;
+    /**
+     * Closes the transport.
+     *
+     * @private
+     */
+    doClose(fn: () => void): void;
+    /**
+     * Returns headers for a response.
+     *
+     * @param {http.IncomingMessage} req
+     * @param {Object} headers - extra headers
+     * @private
+     */
+    private headers;
+}

node_modules/engine.io/build/transports/polling.js

@@ -0,0 +1,332 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Polling = void 0;
+const transport_1 = require("../transport");
+const zlib_1 = require("zlib");
+const accepts = require("accepts");
+const debug_1 = require("debug");
+const debug = (0, debug_1.default)("engine:polling");
+const compressionMethods = {
+    gzip: zlib_1.createGzip,
+    deflate: zlib_1.createDeflate,
+};
+class Polling extends transport_1.Transport {
+    /**
+     * HTTP polling constructor.
+     */
+    constructor(req) {
+        super(req);
+        this.closeTimeout = 30 * 1000;
+    }
+    /**
+     * Transport name
+     */
+    get name() {
+        return "polling";
+    }
+    /**
+     * Overrides onRequest.
+     *
+     * @param {EngineRequest} req
+     * @package
+     */
+    onRequest(req) {
+        const res = req.res;
+        // remove the reference to the ServerResponse object (as the first request of the session is kept in memory by default)
+        req.res = null;
+        if ("GET" === req.method) {
+            this.onPollRequest(req, res);
+        }
+        else if ("POST" === req.method) {
+            this.onDataRequest(req, res);
+        }
+        else {
+            res.writeHead(500);
+            res.end();
+        }
+    }
+    /**
+     * The client sends a request awaiting for us to send data.
+     *
+     * @private
+     */
+    onPollRequest(req, res) {
+        if (this.req) {
+            debug("request overlap");
+            // assert: this.res, '.req and .res should be (un)set together'
+            this.onError("overlap from client");
+            res.writeHead(400);
+            res.end();
+            return;
+        }
+        debug("setting request");
+        this.req = req;
+        this.res = res;
+        const onClose = () => {
+            this.onError("poll connection closed prematurely");
+        };
+        const cleanup = () => {
+            req.removeListener("close", onClose);
+            this.req = this.res = null;
+        };
+        req.cleanup = cleanup;
+        req.on("close", onClose);
+        this.writable = true;
+        this.emit("ready");
+        // if we're still writable but had a pending close, trigger an empty send
+        if (this.writable && this.shouldClose) {
+            debug("triggering empty send to append close packet");
+            this.send([{ type: "noop" }]);
+        }
+    }
+    /**
+     * The client sends a request with data.
+     *
+     * @private
+     */
+    onDataRequest(req, res) {
+        if (this.dataReq) {
+            // assert: this.dataRes, '.dataReq and .dataRes should be (un)set together'
+            this.onError("data request overlap from client");
+            res.writeHead(400);
+            res.end();
+            return;
+        }
+        const isBinary = "application/octet-stream" === req.headers["content-type"];
+        if (isBinary && this.protocol === 4) {
+            return this.onError("invalid content");
+        }
+        this.dataReq = req;
+        this.dataRes = res;
+        let chunks = isBinary ? Buffer.concat([]) : "";
+        const cleanup = () => {
+            req.removeListener("data", onData);
+            req.removeListener("end", onEnd);
+            req.removeListener("close", onClose);
+            this.dataReq = this.dataRes = chunks = null;
+        };
+        const onClose = () => {
+            cleanup();
+            this.onError("data request connection closed prematurely");
+        };
+        const onData = (data) => {
+            let contentLength;
+            if (isBinary) {
+                chunks = Buffer.concat([chunks, data]);
+                contentLength = chunks.length;
+            }
+            else {
+                chunks += data;
+                contentLength = Buffer.byteLength(chunks);
+            }
+            if (contentLength > this.maxHttpBufferSize) {
+                res.writeHead(413).end();
+                cleanup();
+            }
+        };
+        const onEnd = () => {
+            this.onData(chunks);
+            const headers = {
+                // text/html is required instead of text/plain to avoid an
+                // unwanted download dialog on certain user-agents (GH-43)
+                "Content-Type": "text/html",
+                "Content-Length": "2",
+            };
+            res.writeHead(200, this.headers(req, headers));
+            res.end("ok");
+            cleanup();
+        };
+        req.on("close", onClose);
+        if (!isBinary)
+            req.setEncoding("utf8");
+        req.on("data", onData);
+        req.on("end", onEnd);
+    }
+    /**
+     * Processes the incoming data payload.
+     *
+     * @param data - encoded payload
+     * @protected
+     */
+    onData(data) {
+        debug('received "%s"', data);
+        const callback = (packet) => {
+            if ("close" === packet.type) {
+                debug("got xhr close packet");
+                this.onClose();
+                return false;
+            }
+            this.onPacket(packet);
+        };
+        if (this.protocol === 3) {
+            this.parser.decodePayload(data, callback);
+        }
+        else {
+            this.parser.decodePayload(data).forEach(callback);
+        }
+    }
+    /**
+     * Overrides onClose.
+     *
+     * @private
+     */
+    onClose() {
+        if (this.writable) {
+            // close pending poll request
+            this.send([{ type: "noop" }]);
+        }
+        super.onClose();
+    }
+    send(packets) {
+        this.writable = false;
+        if (this.shouldClose) {
+            debug("appending close packet to payload");
+            packets.push({ type: "close" });
+            this.shouldClose();
+            this.shouldClose = null;
+        }
+        const doWrite = (data) => {
+            const compress = packets.some((packet) => {
+                return packet.options && packet.options.compress;
+            });
+            this.write(data, { compress });
+        };
+        if (this.protocol === 3) {
+            this.parser.encodePayload(packets, this.supportsBinary, doWrite);
+        }
+        else {
+            this.parser.encodePayload(packets, doWrite);
+        }
+    }
+    /**
+     * Writes data as response to poll request.
+     *
+     * @param {String} data
+     * @param {Object} options
+     * @private
+     */
+    write(data, options) {
+        debug('writing "%s"', data);
+        this.doWrite(data, options, () => {
+            this.req.cleanup();
+            this.emit("drain");
+        });
+    }
+    /**
+     * Performs the write.
+     *
+     * @protected
+     */
+    doWrite(data, options, callback) {
+        // explicit UTF-8 is required for pages not served under utf
+        const isString = typeof data === "string";
+        const contentType = isString
+            ? "text/plain; charset=UTF-8"
+            : "application/octet-stream";
+        const headers = {
+            "Content-Type": contentType,
+        };
+        const respond = (data) => {
+            headers["Content-Length"] =
+                "string" === typeof data ? Buffer.byteLength(data) : data.length;
+            this.res.writeHead(200, this.headers(this.req, headers));
+            this.res.end(data);
+            callback();
+        };
+        if (!this.httpCompression || !options.compress) {
+            respond(data);
+            return;
+        }
+        const len = isString ? Buffer.byteLength(data) : data.length;
+        if (len < this.httpCompression.threshold) {
+            respond(data);
+            return;
+        }
+        const encoding = accepts(this.req).encodings(["gzip", "deflate"]);
+        if (!encoding) {
+            respond(data);
+            return;
+        }
+        this.compress(data, encoding, (err, data) => {
+            if (err) {
+                this.res.writeHead(500);
+                this.res.end();
+                callback(err);
+                return;
+            }
+            headers["Content-Encoding"] = encoding;
+            respond(data);
+        });
+    }
+    /**
+     * Compresses data.
+     *
+     * @private
+     */
+    compress(data, encoding, callback) {
+        debug("compressing");
+        const buffers = [];
+        let nread = 0;
+        compressionMethods[encoding](this.httpCompression)
+            .on("error", callback)
+            .on("data", function (chunk) {
+            buffers.push(chunk);
+            nread += chunk.length;
+        })
+            .on("end", function () {
+            callback(null, Buffer.concat(buffers, nread));
+        })
+            .end(data);
+    }
+    /**
+     * Closes the transport.
+     *
+     * @private
+     */
+    doClose(fn) {
+        debug("closing");
+        let closeTimeoutTimer;
+        if (this.dataReq) {
+            debug("aborting ongoing data request");
+            this.dataReq.destroy();
+        }
+        const onClose = () => {
+            clearTimeout(closeTimeoutTimer);
+            fn();
+            this.onClose();
+        };
+        if (this.writable) {
+            debug("transport writable - closing right away");
+            this.send([{ type: "close" }]);
+            onClose();
+        }
+        else if (this.discarded) {
+            debug("transport discarded - closing right away");
+            onClose();
+        }
+        else {
+            debug("transport not writable - buffering orderly close");
+            this.shouldClose = onClose;
+            closeTimeoutTimer = setTimeout(onClose, this.closeTimeout);
+        }
+    }
+    /**
+     * Returns headers for a response.
+     *
+     * @param {http.IncomingMessage} req
+     * @param {Object} headers - extra headers
+     * @private
+     */
+    headers(req, headers = {}) {
+        // prevent XSS warnings on IE
+        // https://github.com/LearnBoost/socket.io/pull/1333
+        const ua = req.headers["user-agent"];
+        if (ua && (~ua.indexOf(";MSIE") || ~ua.indexOf("Trident/"))) {
+            headers["X-XSS-Protection"] = "0";
+        }
+        headers["cache-control"] = "no-store";
+        this.emit("headers", headers, req);
+        return headers;
+    }
+}
+exports.Polling = Polling;

node_modules/engine.io/build/transports/websocket.d.ts

@@ -0,0 +1,33 @@
+import { EngineRequest, Transport } from "../transport";
+import type { Packet } from "engine.io-parser";
+import type { PerMessageDeflateOptions } from "ws";
+export declare class WebSocket extends Transport {
+    perMessageDeflate?: boolean | PerMessageDeflateOptions;
+    private socket;
+    /**
+     * WebSocket transport
+     *
+     * @param {EngineRequest} req
+     */
+    constructor(req: EngineRequest);
+    /**
+     * Transport name
+     */
+    get name(): string;
+    /**
+     * Advertise upgrade support.
+     */
+    get handlesUpgrades(): boolean;
+    send(packets: Packet[]): void;
+    /**
+     * Whether the encoding of the WebSocket frame can be skipped.
+     * @param packet
+     * @private
+     */
+    private _canSendPreEncodedFrame;
+    private _doSend;
+    private _doSendLast;
+    private _onSent;
+    private _onSentLast;
+    doClose(fn?: () => void): void;
+}

node_modules/engine.io/build/transports/websocket.js

@@ -0,0 +1,93 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.WebSocket = void 0;
+const transport_1 = require("../transport");
+const debug_1 = require("debug");
+const debug = (0, debug_1.default)("engine:ws");
+class WebSocket extends transport_1.Transport {
+    /**
+     * WebSocket transport
+     *
+     * @param {EngineRequest} req
+     */
+    constructor(req) {
+        super(req);
+        this._doSend = (data) => {
+            this.socket.send(data, this._onSent);
+        };
+        this._doSendLast = (data) => {
+            this.socket.send(data, this._onSentLast);
+        };
+        this._onSent = (err) => {
+            if (err) {
+                this.onError("write error", err.stack);
+            }
+        };
+        this._onSentLast = (err) => {
+            if (err) {
+                this.onError("write error", err.stack);
+            }
+            else {
+                this.emit("drain");
+                this.writable = true;
+                this.emit("ready");
+            }
+        };
+        this.socket = req.websocket;
+        this.socket.on("message", (data, isBinary) => {
+            const message = isBinary ? data : data.toString();
+            debug('received "%s"', message);
+            super.onData(message);
+        });
+        this.socket.once("close", this.onClose.bind(this));
+        this.socket.on("error", this.onError.bind(this));
+        this.writable = true;
+        this.perMessageDeflate = null;
+    }
+    /**
+     * Transport name
+     */
+    get name() {
+        return "websocket";
+    }
+    /**
+     * Advertise upgrade support.
+     */
+    get handlesUpgrades() {
+        return true;
+    }
+    send(packets) {
+        this.writable = false;
+        for (let i = 0; i < packets.length; i++) {
+            const packet = packets[i];
+            const isLast = i + 1 === packets.length;
+            if (this._canSendPreEncodedFrame(packet)) {
+                // the WebSocket frame was computed with WebSocket.Sender.frame()
+                // see https://github.com/websockets/ws/issues/617#issuecomment-283002469
+                // @ts-expect-error use of untyped member
+                this.socket._sender.sendFrame(packet.options.wsPreEncodedFrame, isLast ? this._onSentLast : this._onSent);
+            }
+            else {
+                this.parser.encodePacket(packet, this.supportsBinary, isLast ? this._doSendLast : this._doSend);
+            }
+        }
+    }
+    /**
+     * Whether the encoding of the WebSocket frame can be skipped.
+     * @param packet
+     * @private
+     */
+    _canSendPreEncodedFrame(packet) {
+        var _a, _b, _c;
+        return (!this.perMessageDeflate &&
+            // @ts-expect-error use of untyped member
+            typeof ((_b = (_a = this.socket) === null || _a === void 0 ? void 0 : _a._sender) === null || _b === void 0 ? void 0 : _b.sendFrame) === "function" &&
+            ((_c = packet.options) === null || _c === void 0 ? void 0 : _c.wsPreEncodedFrame) !== undefined);
+    }
+    doClose(fn) {
+        debug("closing");
+        this.socket.close();
+        fn && fn();
+    }
+}
+exports.WebSocket = WebSocket;

node_modules/engine.io/build/transports/webtransport.d.ts

@@ -0,0 +1,12 @@
+import { Transport } from "../transport";
+/**
+ * Reference: https://developer.mozilla.org/en-US/docs/Web/API/WebTransport_API
+ */
+export declare class WebTransport extends Transport {
+    private readonly session;
+    private readonly writer;
+    constructor(session: any, stream: any, reader: any);
+    get name(): string;
+    send(packets: any): Promise<void>;
+    doClose(fn: any): void;
+}

node_modules/engine.io/build/transports/webtransport.js

@@ -0,0 +1,63 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.WebTransport = void 0;
+const transport_1 = require("../transport");
+const debug_1 = require("debug");
+const engine_io_parser_1 = require("engine.io-parser");
+const debug = (0, debug_1.default)("engine:webtransport");
+/**
+ * Reference: https://developer.mozilla.org/en-US/docs/Web/API/WebTransport_API
+ */
+class WebTransport extends transport_1.Transport {
+    constructor(session, stream, reader) {
+        super({ _query: { EIO: "4" } });
+        this.session = session;
+        const transformStream = (0, engine_io_parser_1.createPacketEncoderStream)();
+        transformStream.readable.pipeTo(stream.writable).catch(() => {
+            debug("the stream was closed");
+        });
+        this.writer = transformStream.writable.getWriter();
+        (async () => {
+            try {
+                while (true) {
+                    const { value, done } = await reader.read();
+                    if (done) {
+                        debug("session is closed");
+                        break;
+                    }
+                    debug("received chunk: %o", value);
+                    this.onPacket(value);
+                }
+            }
+            catch (e) {
+                debug("error while reading: %s", e.message);
+            }
+        })();
+        session.closed.then(() => this.onClose());
+        this.writable = true;
+    }
+    get name() {
+        return "webtransport";
+    }
+    async send(packets) {
+        this.writable = false;
+        try {
+            for (let i = 0; i < packets.length; i++) {
+                const packet = packets[i];
+                await this.writer.write(packet);
+            }
+        }
+        catch (e) {
+            debug("error while writing: %s", e.message);
+        }
+        this.emit("drain");
+        this.writable = true;
+        this.emit("ready");
+    }
+    doClose(fn) {
+        debug("closing WebTransport session");
+        this.session.close();
+        fn && fn();
+    }
+}
+exports.WebTransport = WebTransport;

node_modules/engine.io/build/userver.d.ts

@@ -0,0 +1,43 @@
+import { AttachOptions, BaseServer } from "./server";
+import { EngineRequest } from "./transport";
+export interface uOptions {
+    /**
+     * What permessage-deflate compression to use. uWS.DISABLED, uWS.SHARED_COMPRESSOR or any of the uWS.DEDICATED_COMPRESSOR_xxxKB.
+     * @default uWS.DISABLED
+     */
+    compression?: number;
+    /**
+     * Maximum amount of seconds that may pass without sending or getting a message. Connection is closed if this timeout passes. Resolution (granularity) for timeouts are typically 4 seconds, rounded to closest. Disable by using 0.
+     * @default 120
+     */
+    idleTimeout?: number;
+    /**
+     * Maximum length of allowed backpressure per socket when publishing or sending messages. Slow receivers with too high backpressure will be skipped until they catch up or timeout.
+     * @default 1024 * 1024
+     */
+    maxBackpressure?: number;
+}
+/**
+ * An Engine.IO server based on the `uWebSockets.js` package.
+ */
+export declare class uServer extends BaseServer {
+    protected init(): void;
+    protected cleanup(): void;
+    /**
+     * Prepares a request by processing the query string.
+     *
+     * @private
+     */
+    private prepare;
+    protected createTransport(transportName: string, req: EngineRequest): any;
+    /**
+     * Attach the engine to a µWebSockets.js server
+     * @param app
+     * @param options
+     */
+    attach(app: any, options?: AttachOptions & uOptions): void;
+    _applyMiddlewares(req: any, res: any, callback: (err?: any) => void): void;
+    private handleRequest;
+    private handleUpgrade;
+    private abortRequest;
+}

node_modules/engine.io/build/userver.js

@@ -0,0 +1,280 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.uServer = void 0;
+const debug_1 = require("debug");
+const server_1 = require("./server");
+const transports_uws_1 = require("./transports-uws");
+const debug = (0, debug_1.default)("engine:uws");
+/**
+ * An Engine.IO server based on the `uWebSockets.js` package.
+ */
+// TODO export it into its own package
+class uServer extends server_1.BaseServer {
+    init() { }
+    cleanup() { }
+    /**
+     * Prepares a request by processing the query string.
+     *
+     * @private
+     */
+    prepare(req, res) {
+        req.method = req.getMethod().toUpperCase();
+        req.url = req.getUrl();
+        const params = new URLSearchParams(req.getQuery());
+        req._query = Object.fromEntries(params.entries());
+        req.headers = {};
+        req.forEach((key, value) => {
+            req.headers[key] = value;
+        });
+        // @ts-expect-error
+        req.connection = {
+            remoteAddress: Buffer.from(res.getRemoteAddressAsText()).toString(),
+        };
+        res.onAborted(() => {
+            debug("response has been aborted");
+        });
+    }
+    createTransport(transportName, req) {
+        return new transports_uws_1.default[transportName](req);
+    }
+    /**
+     * Attach the engine to a µWebSockets.js server
+     * @param app
+     * @param options
+     */
+    attach(app /* : TemplatedApp */, options = {}) {
+        const path = this._computePath(options);
+        app
+            .any(path, this.handleRequest.bind(this))
+            //
+            .ws(path, {
+            compression: options.compression,
+            idleTimeout: options.idleTimeout,
+            maxBackpressure: options.maxBackpressure,
+            maxPayloadLength: this.opts.maxHttpBufferSize,
+            upgrade: this.handleUpgrade.bind(this),
+            open: (ws) => {
+                const transport = ws.getUserData().transport;
+                transport.socket = ws;
+                transport.writable = true;
+                transport.emit("ready");
+            },
+            message: (ws, message, isBinary) => {
+                ws.getUserData().transport.onData(isBinary ? message : Buffer.from(message).toString());
+            },
+            close: (ws, code, message) => {
+                ws.getUserData().transport.onClose(code, message);
+            },
+        });
+    }
+    _applyMiddlewares(req, res, callback) {
+        if (this.middlewares.length === 0) {
+            return callback();
+        }
+        // needed to buffer headers until the status is computed
+        req.res = new ResponseWrapper(res);
+        super._applyMiddlewares(req, req.res, (err) => {
+            // some middlewares (like express-session) wait for the writeHead() call to flush their headers
+            // see https://github.com/expressjs/session/blob/1010fadc2f071ddf2add94235d72224cf65159c6/index.js#L220-L244
+            req.res.writeHead();
+            callback(err);
+        });
+    }
+    handleRequest(res, req) {
+        debug('handling "%s" http request "%s"', req.getMethod(), req.getUrl());
+        this.prepare(req, res);
+        req.res = res;
+        const callback = (errorCode, errorContext) => {
+            if (errorCode !== undefined) {
+                this.emit("connection_error", {
+                    req,
+                    code: errorCode,
+                    message: server_1.Server.errorMessages[errorCode],
+                    context: errorContext,
+                });
+                this.abortRequest(req.res, errorCode, errorContext);
+                return;
+            }
+            if (req._query.sid) {
+                debug("setting new request for existing client");
+                // @ts-ignore
+                this.clients[req._query.sid].transport.onRequest(req);
+            }
+            else {
+                const closeConnection = (errorCode, errorContext) => this.abortRequest(res, errorCode, errorContext);
+                this.handshake(req._query.transport, req, closeConnection);
+            }
+        };
+        this._applyMiddlewares(req, res, (err) => {
+            if (err) {
+                callback(server_1.Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
+            }
+            else {
+                this.verify(req, false, callback);
+            }
+        });
+    }
+    handleUpgrade(res, req, context) {
+        debug("on upgrade");
+        this.prepare(req, res);
+        req.res = res;
+        const callback = async (errorCode, errorContext) => {
+            if (errorCode !== undefined) {
+                this.emit("connection_error", {
+                    req,
+                    code: errorCode,
+                    message: server_1.Server.errorMessages[errorCode],
+                    context: errorContext,
+                });
+                this.abortRequest(res, errorCode, errorContext);
+                return;
+            }
+            const id = req._query.sid;
+            let transport;
+            if (id) {
+                const client = this.clients[id];
+                if (!client) {
+                    debug("upgrade attempt for closed client");
+                    return res.close();
+                }
+                else if (client.upgrading) {
+                    debug("transport has already been trying to upgrade");
+                    return res.close();
+                }
+                else if (client.upgraded) {
+                    debug("transport had already been upgraded");
+                    return res.close();
+                }
+                else {
+                    debug("upgrading existing transport");
+                    transport = this.createTransport(req._query.transport, req);
+                    client._maybeUpgrade(transport);
+                }
+            }
+            else {
+                transport = await this.handshake(req._query.transport, req, (errorCode, errorContext) => this.abortRequest(res, errorCode, errorContext));
+                if (!transport) {
+                    return;
+                }
+            }
+            // calling writeStatus() triggers the flushing of any header added in a middleware
+            req.res.writeStatus("101 Switching Protocols");
+            res.upgrade({
+                transport,
+            }, req.getHeader("sec-websocket-key"), req.getHeader("sec-websocket-protocol"), req.getHeader("sec-websocket-extensions"), context);
+        };
+        this._applyMiddlewares(req, res, (err) => {
+            if (err) {
+                callback(server_1.Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
+            }
+            else {
+                this.verify(req, true, callback);
+            }
+        });
+    }
+    abortRequest(res, errorCode, errorContext) {
+        const statusCode = errorCode === server_1.Server.errors.FORBIDDEN
+            ? "403 Forbidden"
+            : "400 Bad Request";
+        const message = errorContext && errorContext.message
+            ? errorContext.message
+            : server_1.Server.errorMessages[errorCode];
+        res.writeStatus(statusCode);
+        res.writeHeader("Content-Type", "application/json");
+        res.end(JSON.stringify({
+            code: errorCode,
+            message,
+        }));
+    }
+}
+exports.uServer = uServer;
+class ResponseWrapper {
+    constructor(res) {
+        this.res = res;
+        this.statusWritten = false;
+        this.headers = [];
+        this.isAborted = false;
+    }
+    set statusCode(status) {
+        if (!status) {
+            return;
+        }
+        // FIXME: handle all status codes?
+        this.writeStatus(status === 200 ? "200 OK" : "204 No Content");
+    }
+    writeHead(status) {
+        this.statusCode = status;
+    }
+    setHeader(key, value) {
+        if (Array.isArray(value)) {
+            value.forEach((val) => {
+                this.writeHeader(key, val);
+            });
+        }
+        else {
+            this.writeHeader(key, value);
+        }
+    }
+    removeHeader() {
+        // FIXME: not implemented
+    }
+    // needed by vary: https://github.com/jshttp/vary/blob/5d725d059b3871025cf753e9dfa08924d0bcfa8f/index.js#L134
+    getHeader() { }
+    writeStatus(status) {
+        if (this.isAborted)
+            return;
+        this.res.writeStatus(status);
+        this.statusWritten = true;
+        this.writeBufferedHeaders();
+        return this;
+    }
+    writeHeader(key, value) {
+        if (this.isAborted)
+            return;
+        if (key === "Content-Length") {
+            // the content length is automatically added by uWebSockets.js
+            return;
+        }
+        if (this.statusWritten) {
+            this.res.writeHeader(key, value);
+        }
+        else {
+            this.headers.push([key, value]);
+        }
+    }
+    writeBufferedHeaders() {
+        this.headers.forEach(([key, value]) => {
+            this.res.writeHeader(key, value);
+        });
+    }
+    end(data) {
+        if (this.isAborted)
+            return;
+        this.res.cork(() => {
+            if (!this.statusWritten) {
+                // status will be inferred as "200 OK"
+                this.writeBufferedHeaders();
+            }
+            this.res.end(data);
+        });
+    }
+    onData(fn) {
+        if (this.isAborted)
+            return;
+        this.res.onData(fn);
+    }
+    onAborted(fn) {
+        if (this.isAborted)
+            return;
+        this.res.onAborted(() => {
+            // Any attempt to use the UWS response object after abort will throw!
+            this.isAborted = true;
+            fn();
+        });
+    }
+    cork(fn) {
+        if (this.isAborted)
+            return;
+        this.res.cork(fn);
+    }
+}

node_modules/engine.io/node_modules/accepts/HISTORY.md

@@ -0,0 +1,243 @@
+1.3.8 / 2022-02-02
+==================
+
+  * deps: mime-types@~2.1.34
+    - deps: mime-db@~1.51.0
+  * deps: negotiator@0.6.3
+
+1.3.7 / 2019-04-29
+==================
+
+  * deps: negotiator@0.6.2
+    - Fix sorting charset, encoding, and language with extra parameters
+
+1.3.6 / 2019-04-28
+==================
+
+  * deps: mime-types@~2.1.24
+    - deps: mime-db@~1.40.0
+
+1.3.5 / 2018-02-28
+==================
+
+  * deps: mime-types@~2.1.18
+    - deps: mime-db@~1.33.0
+
+1.3.4 / 2017-08-22
+==================
+
+  * deps: mime-types@~2.1.16
+    - deps: mime-db@~1.29.0
+
+1.3.3 / 2016-05-02
+==================
+
+  * deps: mime-types@~2.1.11
+    - deps: mime-db@~1.23.0
+  * deps: negotiator@0.6.1
+    - perf: improve `Accept` parsing speed
+    - perf: improve `Accept-Charset` parsing speed
+    - perf: improve `Accept-Encoding` parsing speed
+    - perf: improve `Accept-Language` parsing speed
+
+1.3.2 / 2016-03-08
+==================
+
+  * deps: mime-types@~2.1.10
+    - Fix extension of `application/dash+xml`
+    - Update primary extension for `audio/mp4`
+    - deps: mime-db@~1.22.0
+
+1.3.1 / 2016-01-19
+==================
+
+  * deps: mime-types@~2.1.9
+    - deps: mime-db@~1.21.0
+
+1.3.0 / 2015-09-29
+==================
+
+  * deps: mime-types@~2.1.7
+    - deps: mime-db@~1.19.0
+  * deps: negotiator@0.6.0
+    - Fix including type extensions in parameters in `Accept` parsing
+    - Fix parsing `Accept` parameters with quoted equals
+    - Fix parsing `Accept` parameters with quoted semicolons
+    - Lazy-load modules from main entry point
+    - perf: delay type concatenation until needed
+    - perf: enable strict mode
+    - perf: hoist regular expressions
+    - perf: remove closures getting spec properties
+    - perf: remove a closure from media type parsing
+    - perf: remove property delete from media type parsing
+
+1.2.13 / 2015-09-06
+===================
+
+  * deps: mime-types@~2.1.6
+    - deps: mime-db@~1.18.0
+
+1.2.12 / 2015-07-30
+===================
+
+  * deps: mime-types@~2.1.4
+    - deps: mime-db@~1.16.0
+
+1.2.11 / 2015-07-16
+===================
+
+  * deps: mime-types@~2.1.3
+    - deps: mime-db@~1.15.0
+
+1.2.10 / 2015-07-01
+===================
+
+  * deps: mime-types@~2.1.2
+    - deps: mime-db@~1.14.0
+
+1.2.9 / 2015-06-08
+==================
+
+  * deps: mime-types@~2.1.1
+    - perf: fix deopt during mapping
+
+1.2.8 / 2015-06-07
+==================
+
+  * deps: mime-types@~2.1.0
+    - deps: mime-db@~1.13.0
+  * perf: avoid argument reassignment & argument slice
+  * perf: avoid negotiator recursive construction
+  * perf: enable strict mode
+  * perf: remove unnecessary bitwise operator
+
+1.2.7 / 2015-05-10
+==================
+
+  * deps: negotiator@0.5.3
+    - Fix media type parameter matching to be case-insensitive
+
+1.2.6 / 2015-05-07
+==================
+
+  * deps: mime-types@~2.0.11
+    - deps: mime-db@~1.9.1
+  * deps: negotiator@0.5.2
+    - Fix comparing media types with quoted values
+    - Fix splitting media types with quoted commas
+
+1.2.5 / 2015-03-13
+==================
+
+  * deps: mime-types@~2.0.10
+    - deps: mime-db@~1.8.0
+
+1.2.4 / 2015-02-14
+==================
+
+  * Support Node.js 0.6
+  * deps: mime-types@~2.0.9
+    - deps: mime-db@~1.7.0
+  * deps: negotiator@0.5.1
+    - Fix preference sorting to be stable for long acceptable lists
+
+1.2.3 / 2015-01-31
+==================
+
+  * deps: mime-types@~2.0.8
+    - deps: mime-db@~1.6.0
+
+1.2.2 / 2014-12-30
+==================
+
+  * deps: mime-types@~2.0.7
+    - deps: mime-db@~1.5.0
+
+1.2.1 / 2014-12-30
+==================
+
+  * deps: mime-types@~2.0.5
+    - deps: mime-db@~1.3.1
+
+1.2.0 / 2014-12-19
+==================
+
+  * deps: negotiator@0.5.0
+    - Fix list return order when large accepted list
+    - Fix missing identity encoding when q=0 exists
+    - Remove dynamic building of Negotiator class
+
+1.1.4 / 2014-12-10
+==================
+
+  * deps: mime-types@~2.0.4
+    - deps: mime-db@~1.3.0
+
+1.1.3 / 2014-11-09
+==================
+
+  * deps: mime-types@~2.0.3
+    - deps: mime-db@~1.2.0
+
+1.1.2 / 2014-10-14
+==================
+
+  * deps: negotiator@0.4.9
+    - Fix error when media type has invalid parameter
+
+1.1.1 / 2014-09-28
+==================
+
+  * deps: mime-types@~2.0.2
+    - deps: mime-db@~1.1.0
+  * deps: negotiator@0.4.8
+    - Fix all negotiations to be case-insensitive
+    - Stable sort preferences of same quality according to client order
+
+1.1.0 / 2014-09-02
+==================
+
+  * update `mime-types`
+
+1.0.7 / 2014-07-04
+==================
+
+  * Fix wrong type returned from `type` when match after unknown extension
+
+1.0.6 / 2014-06-24
+==================
+
+  * deps: negotiator@0.4.7
+
+1.0.5 / 2014-06-20
+==================
+
+ * fix crash when unknown extension given
+
+1.0.4 / 2014-06-19
+==================
+
+  * use `mime-types`
+
+1.0.3 / 2014-06-11
+==================
+
+  * deps: negotiator@0.4.6
+    - Order by specificity when quality is the same
+
+1.0.2 / 2014-05-29
+==================
+
+  * Fix interpretation when header not in request
+  * deps: pin negotiator@0.4.5
+
+1.0.1 / 2014-01-18
+==================
+
+  * Identity encoding isn't always acceptable
+  * deps: negotiator@~0.4.0
+
+1.0.0 / 2013-12-27
+==================
+
+  * Genesis

node_modules/engine.io/node_modules/accepts/LICENSE

@@ -0,0 +1,23 @@
+(The MIT License)
+
+Copyright (c) 2014 Jonathan Ong <me@jongleberry.com>
+Copyright (c) 2015 Douglas Christopher Wilson <doug@somethingdoug.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/engine.io/node_modules/accepts/README.md

@@ -0,0 +1,140 @@
+# accepts
+
+[![NPM Version][npm-version-image]][npm-url]
+[![NPM Downloads][npm-downloads-image]][npm-url]
+[![Node.js Version][node-version-image]][node-version-url]
+[![Build Status][github-actions-ci-image]][github-actions-ci-url]
+[![Test Coverage][coveralls-image]][coveralls-url]
+
+Higher level content negotiation based on [negotiator](https://www.npmjs.com/package/negotiator).
+Extracted from [koa](https://www.npmjs.com/package/koa) for general use.
+
+In addition to negotiator, it allows:
+
+- Allows types as an array or arguments list, ie `(['text/html', 'application/json'])`
+  as well as `('text/html', 'application/json')`.
+- Allows type shorthands such as `json`.
+- Returns `false` when no types match
+- Treats non-existent headers as `*`
+
+## Installation
+
+This is a [Node.js](https://nodejs.org/en/) module available through the
+[npm registry](https://www.npmjs.com/). Installation is done using the
+[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
+
+```sh
+$ npm install accepts
+```
+
+## API
+
+```js
+var accepts = require('accepts')
+```
+
+### accepts(req)
+
+Create a new `Accepts` object for the given `req`.
+
+#### .charset(charsets)
+
+Return the first accepted charset. If nothing in `charsets` is accepted,
+then `false` is returned.
+
+#### .charsets()
+
+Return the charsets that the request accepts, in the order of the client's
+preference (most preferred first).
+
+#### .encoding(encodings)
+
+Return the first accepted encoding. If nothing in `encodings` is accepted,
+then `false` is returned.
+
+#### .encodings()
+
+Return the encodings that the request accepts, in the order of the client's
+preference (most preferred first).
+
+#### .language(languages)
+
+Return the first accepted language. If nothing in `languages` is accepted,
+then `false` is returned.
+
+#### .languages()
+
+Return the languages that the request accepts, in the order of the client's
+preference (most preferred first).
+
+#### .type(types)
+
+Return the first accepted type (and it is returned as the same text as what
+appears in the `types` array). If nothing in `types` is accepted, then `false`
+is returned.
+
+The `types` array can contain full MIME types or file extensions. Any value
+that is not a full MIME types is passed to `require('mime-types').lookup`.
+
+#### .types()
+
+Return the types that the request accepts, in the order of the client's
+preference (most preferred first).
+
+## Examples
+
+### Simple type negotiation
+
+This simple example shows how to use `accepts` to return a different typed
+respond body based on what the client wants to accept. The server lists it's
+preferences in order and will get back the best match between the client and
+server.
+
+```js
+var accepts = require('accepts')
+var http = require('http')
+
+function app (req, res) {
+  var accept = accepts(req)
+
+  // the order of this list is significant; should be server preferred order
+  switch (accept.type(['json', 'html'])) {
+    case 'json':
+      res.setHeader('Content-Type', 'application/json')
+      res.write('{"hello":"world!"}')
+      break
+    case 'html':
+      res.setHeader('Content-Type', 'text/html')
+      res.write('<b>hello, world!</b>')
+      break
+    default:
+      // the fallback is text/plain, so no need to specify it above
+      res.setHeader('Content-Type', 'text/plain')
+      res.write('hello, world!')
+      break
+  }
+
+  res.end()
+}
+
+http.createServer(app).listen(3000)
+```
+
+You can test this out with the cURL program:
+```sh
+curl -I -H'Accept: text/html' http://localhost:3000/
+```
+
+## License
+
+[MIT](LICENSE)
+
+[coveralls-image]: https://badgen.net/coveralls/c/github/jshttp/accepts/master
+[coveralls-url]: https://coveralls.io/r/jshttp/accepts?branch=master
+[github-actions-ci-image]: https://badgen.net/github/checks/jshttp/accepts/master?label=ci
+[github-actions-ci-url]: https://github.com/jshttp/accepts/actions/workflows/ci.yml
+[node-version-image]: https://badgen.net/npm/node/accepts
+[node-version-url]: https://nodejs.org/en/download
+[npm-downloads-image]: https://badgen.net/npm/dm/accepts
+[npm-url]: https://npmjs.org/package/accepts
+[npm-version-image]: https://badgen.net/npm/v/accepts

node_modules/engine.io/node_modules/accepts/index.js

@@ -0,0 +1,238 @@
+/*!
+ * accepts
+ * Copyright(c) 2014 Jonathan Ong
+ * Copyright(c) 2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict'
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var Negotiator = require('negotiator')
+var mime = require('mime-types')
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = Accepts
+
+/**
+ * Create a new Accepts object for the given req.
+ *
+ * @param {object} req
+ * @public
+ */
+
+function Accepts (req) {
+  if (!(this instanceof Accepts)) {
+    return new Accepts(req)
+  }
+
+  this.headers = req.headers
+  this.negotiator = new Negotiator(req)
+}
+
+/**
+ * Check if the given `type(s)` is acceptable, returning
+ * the best match when true, otherwise `undefined`, in which
+ * case you should respond with 406 "Not Acceptable".
+ *
+ * The `type` value may be a single mime type string
+ * such as "application/json", the extension name
+ * such as "json" or an array `["json", "html", "text/plain"]`. When a list
+ * or array is given the _best_ match, if any is returned.
+ *
+ * Examples:
+ *
+ *     // Accept: text/html
+ *     this.types('html');
+ *     // => "html"
+ *
+ *     // Accept: text/*, application/json
+ *     this.types('html');
+ *     // => "html"
+ *     this.types('text/html');
+ *     // => "text/html"
+ *     this.types('json', 'text');
+ *     // => "json"
+ *     this.types('application/json');
+ *     // => "application/json"
+ *
+ *     // Accept: text/*, application/json
+ *     this.types('image/png');
+ *     this.types('png');
+ *     // => undefined
+ *
+ *     // Accept: text/*;q=.5, application/json
+ *     this.types(['html', 'json']);
+ *     this.types('html', 'json');
+ *     // => "json"
+ *
+ * @param {String|Array} types...
+ * @return {String|Array|Boolean}
+ * @public
+ */
+
+Accepts.prototype.type =
+Accepts.prototype.types = function (types_) {
+  var types = types_
+
+  // support flattened arguments
+  if (types && !Array.isArray(types)) {
+    types = new Array(arguments.length)
+    for (var i = 0; i < types.length; i++) {
+      types[i] = arguments[i]
+    }
+  }
+
+  // no types, return all requested types
+  if (!types || types.length === 0) {
+    return this.negotiator.mediaTypes()
+  }
+
+  // no accept header, return first given type
+  if (!this.headers.accept) {
+    return types[0]
+  }
+
+  var mimes = types.map(extToMime)
+  var accepts = this.negotiator.mediaTypes(mimes.filter(validMime))
+  var first = accepts[0]
+
+  return first
+    ? types[mimes.indexOf(first)]
+    : false
+}
+
+/**
+ * Return accepted encodings or best fit based on `encodings`.
+ *
+ * Given `Accept-Encoding: gzip, deflate`
+ * an array sorted by quality is returned:
+ *
+ *     ['gzip', 'deflate']
+ *
+ * @param {String|Array} encodings...
+ * @return {String|Array}
+ * @public
+ */
+
+Accepts.prototype.encoding =
+Accepts.prototype.encodings = function (encodings_) {
+  var encodings = encodings_
+
+  // support flattened arguments
+  if (encodings && !Array.isArray(encodings)) {
+    encodings = new Array(arguments.length)
+    for (var i = 0; i < encodings.length; i++) {
+      encodings[i] = arguments[i]
+    }
+  }
+
+  // no encodings, return all requested encodings
+  if (!encodings || encodings.length === 0) {
+    return this.negotiator.encodings()
+  }
+
+  return this.negotiator.encodings(encodings)[0] || false
+}
+
+/**
+ * Return accepted charsets or best fit based on `charsets`.
+ *
+ * Given `Accept-Charset: utf-8, iso-8859-1;q=0.2, utf-7;q=0.5`
+ * an array sorted by quality is returned:
+ *
+ *     ['utf-8', 'utf-7', 'iso-8859-1']
+ *
+ * @param {String|Array} charsets...
+ * @return {String|Array}
+ * @public
+ */
+
+Accepts.prototype.charset =
+Accepts.prototype.charsets = function (charsets_) {
+  var charsets = charsets_
+
+  // support flattened arguments
+  if (charsets && !Array.isArray(charsets)) {
+    charsets = new Array(arguments.length)
+    for (var i = 0; i < charsets.length; i++) {
+      charsets[i] = arguments[i]
+    }
+  }
+
+  // no charsets, return all requested charsets
+  if (!charsets || charsets.length === 0) {
+    return this.negotiator.charsets()
+  }
+
+  return this.negotiator.charsets(charsets)[0] || false
+}
+
+/**
+ * Return accepted languages or best fit based on `langs`.
+ *
+ * Given `Accept-Language: en;q=0.8, es, pt`
+ * an array sorted by quality is returned:
+ *
+ *     ['es', 'pt', 'en']
+ *
+ * @param {String|Array} langs...
+ * @return {Array|String}
+ * @public
+ */
+
+Accepts.prototype.lang =
+Accepts.prototype.langs =
+Accepts.prototype.language =
+Accepts.prototype.languages = function (languages_) {
+  var languages = languages_
+
+  // support flattened arguments
+  if (languages && !Array.isArray(languages)) {
+    languages = new Array(arguments.length)
+    for (var i = 0; i < languages.length; i++) {
+      languages[i] = arguments[i]
+    }
+  }
+
+  // no languages, return all requested languages
+  if (!languages || languages.length === 0) {
+    return this.negotiator.languages()
+  }
+
+  return this.negotiator.languages(languages)[0] || false
+}
+
+/**
+ * Convert extnames to mime.
+ *
+ * @param {String} type
+ * @return {String}
+ * @private
+ */
+
+function extToMime (type) {
+  return type.indexOf('/') === -1
+    ? mime.lookup(type)
+    : type
+}
+
+/**
+ * Check if mime is valid.
+ *
+ * @param {String} type
+ * @return {String}
+ * @private
+ */
+
+function validMime (type) {
+  return typeof type === 'string'
+}

node_modules/engine.io/node_modules/accepts/package.json

@@ -0,0 +1,47 @@
+{
+  "name": "accepts",
+  "description": "Higher-level content negotiation",
+  "version": "1.3.8",
+  "contributors": [
+    "Douglas Christopher Wilson <doug@somethingdoug.com>",
+    "Jonathan Ong <me@jongleberry.com> (http://jongleberry.com)"
+  ],
+  "license": "MIT",
+  "repository": "jshttp/accepts",
+  "dependencies": {
+    "mime-types": "~2.1.34",
+    "negotiator": "0.6.3"
+  },
+  "devDependencies": {
+    "deep-equal": "1.0.1",
+    "eslint": "7.32.0",
+    "eslint-config-standard": "14.1.1",
+    "eslint-plugin-import": "2.25.4",
+    "eslint-plugin-markdown": "2.2.1",
+    "eslint-plugin-node": "11.1.0",
+    "eslint-plugin-promise": "4.3.1",
+    "eslint-plugin-standard": "4.1.0",
+    "mocha": "9.2.0",
+    "nyc": "15.1.0"
+  },
+  "files": [
+    "LICENSE",
+    "HISTORY.md",
+    "index.js"
+  ],
+  "engines": {
+    "node": ">= 0.6"
+  },
+  "scripts": {
+    "lint": "eslint .",
+    "test": "mocha --reporter spec --check-leaks --bail test/",
+    "test-ci": "nyc --reporter=lcov --reporter=text npm test",
+    "test-cov": "nyc --reporter=html --reporter=text npm test"
+  },
+  "keywords": [
+    "content",
+    "negotiation",
+    "accept",
+    "accepts"
+  ]
+}

node_modules/engine.io/node_modules/mime-db/HISTORY.md

@@ -0,0 +1,507 @@
+1.52.0 / 2022-02-21
+===================
+
+  * Add extensions from IANA for more `image/*` types
+  * Add extension `.asc` to `application/pgp-keys`
+  * Add extensions to various XML types
+  * Add new upstream MIME types
+
+1.51.0 / 2021-11-08
+===================
+
+  * Add new upstream MIME types
+  * Mark `image/vnd.microsoft.icon` as compressible
+  * Mark `image/vnd.ms-dds` as compressible
+
+1.50.0 / 2021-09-15
+===================
+
+  * Add deprecated iWorks mime types and extensions
+  * Add new upstream MIME types
+
+1.49.0 / 2021-07-26
+===================
+
+  * Add extension `.trig` to `application/trig`
+  * Add new upstream MIME types
+
+1.48.0 / 2021-05-30
+===================
+
+  * Add extension `.mvt` to `application/vnd.mapbox-vector-tile`
+  * Add new upstream MIME types
+  * Mark `text/yaml` as compressible
+
+1.47.0 / 2021-04-01
+===================
+
+  * Add new upstream MIME types
+  * Remove ambigious extensions from IANA for `application/*+xml` types
+  * Update primary extension to `.es` for `application/ecmascript`
+
+1.46.0 / 2021-02-13
+===================
+
+  * Add extension `.amr` to `audio/amr`
+  * Add extension `.m4s` to `video/iso.segment`
+  * Add extension `.opus` to `audio/ogg`
+  * Add new upstream MIME types
+
+1.45.0 / 2020-09-22
+===================
+
+  * Add `application/ubjson` with extension `.ubj`
+  * Add `image/avif` with extension `.avif`
+  * Add `image/ktx2` with extension `.ktx2`
+  * Add extension `.dbf` to `application/vnd.dbf`
+  * Add extension `.rar` to `application/vnd.rar`
+  * Add extension `.td` to `application/urc-targetdesc+xml`
+  * Add new upstream MIME types
+  * Fix extension of `application/vnd.apple.keynote` to be `.key`
+
+1.44.0 / 2020-04-22
+===================
+
+  * Add charsets from IANA
+  * Add extension `.cjs` to `application/node`
+  * Add new upstream MIME types
+
+1.43.0 / 2020-01-05
+===================
+
+  * Add `application/x-keepass2` with extension `.kdbx`
+  * Add extension `.mxmf` to `audio/mobile-xmf`
+  * Add extensions from IANA for `application/*+xml` types
+  * Add new upstream MIME types
+
+1.42.0 / 2019-09-25
+===================
+
+  * Add `image/vnd.ms-dds` with extension `.dds`
+  * Add new upstream MIME types
+  * Remove compressible from `multipart/mixed`
+
+1.41.0 / 2019-08-30
+===================
+
+  * Add new upstream MIME types
+  * Add `application/toml` with extension `.toml`
+  * Mark `font/ttf` as compressible
+
+1.40.0 / 2019-04-20
+===================
+
+  * Add extensions from IANA for `model/*` types
+  * Add `text/mdx` with extension `.mdx`
+
+1.39.0 / 2019-04-04
+===================
+
+  * Add extensions `.siv` and `.sieve` to `application/sieve`
+  * Add new upstream MIME types
+
+1.38.0 / 2019-02-04
+===================
+
+  * Add extension `.nq` to `application/n-quads`
+  * Add extension `.nt` to `application/n-triples`
+  * Add new upstream MIME types
+  * Mark `text/less` as compressible
+
+1.37.0 / 2018-10-19
+===================
+
+  * Add extensions to HEIC image types
+  * Add new upstream MIME types
+
+1.36.0 / 2018-08-20
+===================
+
+  * Add Apple file extensions from IANA
+  * Add extensions from IANA for `image/*` types
+  * Add new upstream MIME types
+
+1.35.0 / 2018-07-15
+===================
+
+  * Add extension `.owl` to `application/rdf+xml`
+  * Add new upstream MIME types
+    - Removes extension `.woff` from `application/font-woff`
+
+1.34.0 / 2018-06-03
+===================
+
+  * Add extension `.csl` to `application/vnd.citationstyles.style+xml`
+  * Add extension `.es` to `application/ecmascript`
+  * Add new upstream MIME types
+  * Add `UTF-8` as default charset for `text/turtle`
+  * Mark all XML-derived types as compressible
+
+1.33.0 / 2018-02-15
+===================
+
+  * Add extensions from IANA for `message/*` types
+  * Add new upstream MIME types
+  * Fix some incorrect OOXML types
+  * Remove `application/font-woff2`
+
+1.32.0 / 2017-11-29
+===================
+
+  * Add new upstream MIME types
+  * Update `text/hjson` to registered `application/hjson`
+  * Add `text/shex` with extension `.shex`
+
+1.31.0 / 2017-10-25
+===================
+
+  * Add `application/raml+yaml` with extension `.raml`
+  * Add `application/wasm` with extension `.wasm`
+  * Add new `font` type from IANA
+  * Add new upstream font extensions
+  * Add new upstream MIME types
+  * Add extensions for JPEG-2000 images
+
+1.30.0 / 2017-08-27
+===================
+
+  * Add `application/vnd.ms-outlook`
+  * Add `application/x-arj`
+  * Add extension `.mjs` to `application/javascript`
+  * Add glTF types and extensions
+  * Add new upstream MIME types
+  * Add `text/x-org`
+  * Add VirtualBox MIME types
+  * Fix `source` records for `video/*` types that are IANA
+  * Update `font/opentype` to registered `font/otf`
+
+1.29.0 / 2017-07-10
+===================
+
+  * Add `application/fido.trusted-apps+json`
+  * Add extension `.wadl` to `application/vnd.sun.wadl+xml`
+  * Add new upstream MIME types
+  * Add `UTF-8` as default charset for `text/css`
+
+1.28.0 / 2017-05-14
+===================
+
+  * Add new upstream MIME types
+  * Add extension `.gz` to `application/gzip`
+  * Update extensions `.md` and `.markdown` to be `text/markdown`
+
+1.27.0 / 2017-03-16
+===================
+
+  * Add new upstream MIME types
+  * Add `image/apng` with extension `.apng`
+
+1.26.0 / 2017-01-14
+===================
+
+  * Add new upstream MIME types
+  * Add extension `.geojson` to `application/geo+json`
+
+1.25.0 / 2016-11-11
+===================
+
+  * Add new upstream MIME types
+
+1.24.0 / 2016-09-18
+===================
+
+  * Add `audio/mp3`
+  * Add new upstream MIME types
+
+1.23.0 / 2016-05-01
+===================
+
+  * Add new upstream MIME types
+  * Add extension `.3gpp` to `audio/3gpp`
+
+1.22.0 / 2016-02-15
+===================
+
+  * Add `text/slim`
+  * Add extension `.rng` to `application/xml`
+  * Add new upstream MIME types
+  * Fix extension of `application/dash+xml` to be `.mpd`
+  * Update primary extension to `.m4a` for `audio/mp4`
+
+1.21.0 / 2016-01-06
+===================
+
+  * Add Google document types
+  * Add new upstream MIME types
+
+1.20.0 / 2015-11-10
+===================
+
+  * Add `text/x-suse-ymp`
+  * Add new upstream MIME types
+
+1.19.0 / 2015-09-17
+===================
+
+  * Add `application/vnd.apple.pkpass`
+  * Add new upstream MIME types
+
+1.18.0 / 2015-09-03
+===================
+
+  * Add new upstream MIME types
+
+1.17.0 / 2015-08-13
+===================
+
+  * Add `application/x-msdos-program`
+  * Add `audio/g711-0`
+  * Add `image/vnd.mozilla.apng`
+  * Add extension `.exe` to `application/x-msdos-program`
+
+1.16.0 / 2015-07-29
+===================
+
+  * Add `application/vnd.uri-map`
+
+1.15.0 / 2015-07-13
+===================
+
+  * Add `application/x-httpd-php`
+
+1.14.0 / 2015-06-25
+===================
+
+  * Add `application/scim+json`
+  * Add `application/vnd.3gpp.ussd+xml`
+  * Add `application/vnd.biopax.rdf+xml`
+  * Add `text/x-processing`
+
+1.13.0 / 2015-06-07
+===================
+
+  * Add nginx as a source
+  * Add `application/x-cocoa`
+  * Add `application/x-java-archive-diff`
+  * Add `application/x-makeself`
+  * Add `application/x-perl`
+  * Add `application/x-pilot`
+  * Add `application/x-redhat-package-manager`
+  * Add `application/x-sea`
+  * Add `audio/x-m4a`
+  * Add `audio/x-realaudio`
+  * Add `image/x-jng`
+  * Add `text/mathml`
+
+1.12.0 / 2015-06-05
+===================
+
+  * Add `application/bdoc`
+  * Add `application/vnd.hyperdrive+json`
+  * Add `application/x-bdoc`
+  * Add extension `.rtf` to `text/rtf`
+
+1.11.0 / 2015-05-31
+===================
+
+  * Add `audio/wav`
+  * Add `audio/wave`
+  * Add extension `.litcoffee` to `text/coffeescript`
+  * Add extension `.sfd-hdstx` to `application/vnd.hydrostatix.sof-data`
+  * Add extension `.n-gage` to `application/vnd.nokia.n-gage.symbian.install`
+
+1.10.0 / 2015-05-19
+===================
+
+  * Add `application/vnd.balsamiq.bmpr`
+  * Add `application/vnd.microsoft.portable-executable`
+  * Add `application/x-ns-proxy-autoconfig`
+
+1.9.1 / 2015-04-19
+==================
+
+  * Remove `.json` extension from `application/manifest+json`
+    - This is causing bugs downstream
+
+1.9.0 / 2015-04-19
+==================
+
+  * Add `application/manifest+json`
+  * Add `application/vnd.micro+json`
+  * Add `image/vnd.zbrush.pcx`
+  * Add `image/x-ms-bmp`
+
+1.8.0 / 2015-03-13
+==================
+
+  * Add `application/vnd.citationstyles.style+xml`
+  * Add `application/vnd.fastcopy-disk-image`
+  * Add `application/vnd.gov.sk.xmldatacontainer+xml`
+  * Add extension `.jsonld` to `application/ld+json`
+
+1.7.0 / 2015-02-08
+==================
+
+  * Add `application/vnd.gerber`
+  * Add `application/vnd.msa-disk-image`
+
+1.6.1 / 2015-02-05
+==================
+
+  * Community extensions ownership transferred from `node-mime`
+
+1.6.0 / 2015-01-29
+==================
+
+  * Add `application/jose`
+  * Add `application/jose+json`
+  * Add `application/json-seq`
+  * Add `application/jwk+json`
+  * Add `application/jwk-set+json`
+  * Add `application/jwt`
+  * Add `application/rdap+json`
+  * Add `application/vnd.gov.sk.e-form+xml`
+  * Add `application/vnd.ims.imsccv1p3`
+
+1.5.0 / 2014-12-30
+==================
+
+  * Add `application/vnd.oracle.resource+json`
+  * Fix various invalid MIME type entries
+    - `application/mbox+xml`
+    - `application/oscp-response`
+    - `application/vwg-multiplexed`
+    - `audio/g721`
+
+1.4.0 / 2014-12-21
+==================
+
+  * Add `application/vnd.ims.imsccv1p2`
+  * Fix various invalid MIME type entries
+    - `application/vnd-acucobol`
+    - `application/vnd-curl`
+    - `application/vnd-dart`
+    - `application/vnd-dxr`
+    - `application/vnd-fdf`
+    - `application/vnd-mif`
+    - `application/vnd-sema`
+    - `application/vnd-wap-wmlc`
+    - `application/vnd.adobe.flash-movie`
+    - `application/vnd.dece-zip`
+    - `application/vnd.dvb_service`
+    - `application/vnd.micrografx-igx`
+    - `application/vnd.sealed-doc`
+    - `application/vnd.sealed-eml`
+    - `application/vnd.sealed-mht`
+    - `application/vnd.sealed-ppt`
+    - `application/vnd.sealed-tiff`
+    - `application/vnd.sealed-xls`
+    - `application/vnd.sealedmedia.softseal-html`
+    - `application/vnd.sealedmedia.softseal-pdf`
+    - `application/vnd.wap-slc`
+    - `application/vnd.wap-wbxml`
+    - `audio/vnd.sealedmedia.softseal-mpeg`
+    - `image/vnd-djvu`
+    - `image/vnd-svf`
+    - `image/vnd-wap-wbmp`
+    - `image/vnd.sealed-png`
+    - `image/vnd.sealedmedia.softseal-gif`
+    - `image/vnd.sealedmedia.softseal-jpg`
+    - `model/vnd-dwf`
+    - `model/vnd.parasolid.transmit-binary`
+    - `model/vnd.parasolid.transmit-text`
+    - `text/vnd-a`
+    - `text/vnd-curl`
+    - `text/vnd.wap-wml`
+  * Remove example template MIME types
+    - `application/example`
+    - `audio/example`
+    - `image/example`
+    - `message/example`
+    - `model/example`
+    - `multipart/example`
+    - `text/example`
+    - `video/example`
+
+1.3.1 / 2014-12-16
+==================
+
+  * Fix missing extensions
+    - `application/json5`
+    - `text/hjson`
+
+1.3.0 / 2014-12-07
+==================
+
+  * Add `application/a2l`
+  * Add `application/aml`
+  * Add `application/atfx`
+  * Add `application/atxml`
+  * Add `application/cdfx+xml`
+  * Add `application/dii`
+  * Add `application/json5`
+  * Add `application/lxf`
+  * Add `application/mf4`
+  * Add `application/vnd.apache.thrift.compact`
+  * Add `application/vnd.apache.thrift.json`
+  * Add `application/vnd.coffeescript`
+  * Add `application/vnd.enphase.envoy`
+  * Add `application/vnd.ims.imsccv1p1`
+  * Add `text/csv-schema`
+  * Add `text/hjson`
+  * Add `text/markdown`
+  * Add `text/yaml`
+
+1.2.0 / 2014-11-09
+==================
+
+  * Add `application/cea`
+  * Add `application/dit`
+  * Add `application/vnd.gov.sk.e-form+zip`
+  * Add `application/vnd.tmd.mediaflex.api+xml`
+  * Type `application/epub+zip` is now IANA-registered
+
+1.1.2 / 2014-10-23
+==================
+
+  * Rebuild database for `application/x-www-form-urlencoded` change
+
+1.1.1 / 2014-10-20
+==================
+
+  * Mark `application/x-www-form-urlencoded` as compressible.
+
+1.1.0 / 2014-09-28
+==================
+
+  * Add `application/font-woff2`
+
+1.0.3 / 2014-09-25
+==================
+
+  * Fix engine requirement in package
+
+1.0.2 / 2014-09-25
+==================
+
+  * Add `application/coap-group+json`
+  * Add `application/dcd`
+  * Add `application/vnd.apache.thrift.binary`
+  * Add `image/vnd.tencent.tap`
+  * Mark all JSON-derived types as compressible
+  * Update `text/vtt` data
+
+1.0.1 / 2014-08-30
+==================
+
+  * Fix extension ordering
+
+1.0.0 / 2014-08-30
+==================
+
+  * Add `application/atf`
+  * Add `application/merge-patch+json`
+  * Add `multipart/x-mixed-replace`
+  * Add `source: 'apache'` metadata
+  * Add `source: 'iana'` metadata
+  * Remove badly-assumed charset data

node_modules/engine.io/node_modules/mime-db/LICENSE

@@ -0,0 +1,23 @@
+(The MIT License)
+
+Copyright (c) 2014 Jonathan Ong <me@jongleberry.com>
+Copyright (c) 2015-2022 Douglas Christopher Wilson <doug@somethingdoug.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/engine.io/node_modules/mime-db/README.md

@@ -0,0 +1,100 @@
+# mime-db
+
+[![NPM Version][npm-version-image]][npm-url]
+[![NPM Downloads][npm-downloads-image]][npm-url]
+[![Node.js Version][node-image]][node-url]
+[![Build Status][ci-image]][ci-url]
+[![Coverage Status][coveralls-image]][coveralls-url]
+
+This is a large database of mime types and information about them.
+It consists of a single, public JSON file and does not include any logic,
+allowing it to remain as un-opinionated as possible with an API.
+It aggregates data from the following sources:
+
+- http://www.iana.org/assignments/media-types/media-types.xhtml
+- http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types
+- http://hg.nginx.org/nginx/raw-file/default/conf/mime.types
+
+## Installation
+
+```bash
+npm install mime-db
+```
+
+### Database Download
+
+If you're crazy enough to use this in the browser, you can just grab the
+JSON file using [jsDelivr](https://www.jsdelivr.com/). It is recommended to
+replace `master` with [a release tag](https://github.com/jshttp/mime-db/tags)
+as the JSON format may change in the future.
+
+```
+https://cdn.jsdelivr.net/gh/jshttp/mime-db@master/db.json
+```
+
+## Usage
+
+```js
+var db = require('mime-db')
+
+// grab data on .js files
+var data = db['application/javascript']
+```
+
+## Data Structure
+
+The JSON file is a map lookup for lowercased mime types.
+Each mime type has the following properties:
+
+- `.source` - where the mime type is defined.
+    If not set, it's probably a custom media type.
+    - `apache` - [Apache common media types](http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types)
+    - `iana` - [IANA-defined media types](http://www.iana.org/assignments/media-types/media-types.xhtml)
+    - `nginx` - [nginx media types](http://hg.nginx.org/nginx/raw-file/default/conf/mime.types)
+- `.extensions[]` - known extensions associated with this mime type.
+- `.compressible` - whether a file of this type can be gzipped.
+- `.charset` - the default charset associated with this type, if any.
+
+If unknown, every property could be `undefined`.
+
+## Contributing
+
+To edit the database, only make PRs against `src/custom-types.json` or
+`src/custom-suffix.json`.
+
+The `src/custom-types.json` file is a JSON object with the MIME type as the
+keys and the values being an object with the following keys:
+
+- `compressible` - leave out if you don't know, otherwise `true`/`false` to
+  indicate whether the data represented by the type is typically compressible.
+- `extensions` - include an array of file extensions that are associated with
+  the type.
+- `notes` - human-readable notes about the type, typically what the type is.
+- `sources` - include an array of URLs of where the MIME type and the associated
+  extensions are sourced from. This needs to be a [primary source](https://en.wikipedia.org/wiki/Primary_source);
+  links to type aggregating sites and Wikipedia are _not acceptable_.
+
+To update the build, run `npm run build`.
+
+### Adding Custom Media Types
+
+The best way to get new media types included in this library is to register
+them with the IANA. The community registration procedure is outlined in
+[RFC 6838 section 5](http://tools.ietf.org/html/rfc6838#section-5). Types
+registered with the IANA are automatically pulled into this library.
+
+If that is not possible / feasible, they can be added directly here as a
+"custom" type. To do this, it is required to have a primary source that
+definitively lists the media type. If an extension is going to be listed as
+associateed with this media type, the source must definitively link the
+media type and extension as well.
+
+[ci-image]: https://badgen.net/github/checks/jshttp/mime-db/master?label=ci
+[ci-url]: https://github.com/jshttp/mime-db/actions?query=workflow%3Aci
+[coveralls-image]: https://badgen.net/coveralls/c/github/jshttp/mime-db/master
+[coveralls-url]: https://coveralls.io/r/jshttp/mime-db?branch=master
+[node-image]: https://badgen.net/npm/node/mime-db
+[node-url]: https://nodejs.org/en/download
+[npm-downloads-image]: https://badgen.net/npm/dm/mime-db
+[npm-url]: https://npmjs.org/package/mime-db
+[npm-version-image]: https://badgen.net/npm/v/mime-db

node_modules/engine.io/node_modules/mime-db/index.js

@@ -0,0 +1,12 @@
+/*!
+ * mime-db
+ * Copyright(c) 2014 Jonathan Ong
+ * Copyright(c) 2015-2022 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+/**
+ * Module exports.
+ */
+
+module.exports = require('./db.json')

node_modules/engine.io/node_modules/mime-db/package.json

@@ -0,0 +1,60 @@
+{
+  "name": "mime-db",
+  "description": "Media Type Database",
+  "version": "1.52.0",
+  "contributors": [
+    "Douglas Christopher Wilson <doug@somethingdoug.com>",
+    "Jonathan Ong <me@jongleberry.com> (http://jongleberry.com)",
+    "Robert Kieffer <robert@broofa.com> (http://github.com/broofa)"
+  ],
+  "license": "MIT",
+  "keywords": [
+    "mime",
+    "db",
+    "type",
+    "types",
+    "database",
+    "charset",
+    "charsets"
+  ],
+  "repository": "jshttp/mime-db",
+  "devDependencies": {
+    "bluebird": "3.7.2",
+    "co": "4.6.0",
+    "cogent": "1.0.1",
+    "csv-parse": "4.16.3",
+    "eslint": "7.32.0",
+    "eslint-config-standard": "15.0.1",
+    "eslint-plugin-import": "2.25.4",
+    "eslint-plugin-markdown": "2.2.1",
+    "eslint-plugin-node": "11.1.0",
+    "eslint-plugin-promise": "5.1.1",
+    "eslint-plugin-standard": "4.1.0",
+    "gnode": "0.1.2",
+    "media-typer": "1.1.0",
+    "mocha": "9.2.1",
+    "nyc": "15.1.0",
+    "raw-body": "2.5.0",
+    "stream-to-array": "2.3.0"
+  },
+  "files": [
+    "HISTORY.md",
+    "LICENSE",
+    "README.md",
+    "db.json",
+    "index.js"
+  ],
+  "engines": {
+    "node": ">= 0.6"
+  },
+  "scripts": {
+    "build": "node scripts/build",
+    "fetch": "node scripts/fetch-apache && gnode scripts/fetch-iana && node scripts/fetch-nginx",
+    "lint": "eslint .",
+    "test": "mocha --reporter spec --bail --check-leaks test/",
+    "test-ci": "nyc --reporter=lcov --reporter=text npm test",
+    "test-cov": "nyc --reporter=html --reporter=text npm test",
+    "update": "npm run fetch && npm run build",
+    "version": "node scripts/version-history.js && git add HISTORY.md"
+  }
+}

node_modules/engine.io/node_modules/mime-types/HISTORY.md

@@ -0,0 +1,397 @@
+2.1.35 / 2022-03-12
+===================
+
+  * deps: mime-db@1.52.0
+    - Add extensions from IANA for more `image/*` types
+    - Add extension `.asc` to `application/pgp-keys`
+    - Add extensions to various XML types
+    - Add new upstream MIME types
+
+2.1.34 / 2021-11-08
+===================
+
+  * deps: mime-db@1.51.0
+    - Add new upstream MIME types
+
+2.1.33 / 2021-10-01
+===================
+
+  * deps: mime-db@1.50.0
+    - Add deprecated iWorks mime types and extensions
+    - Add new upstream MIME types
+
+2.1.32 / 2021-07-27
+===================
+
+  * deps: mime-db@1.49.0
+    - Add extension `.trig` to `application/trig`
+    - Add new upstream MIME types
+
+2.1.31 / 2021-06-01
+===================
+
+  * deps: mime-db@1.48.0
+    - Add extension `.mvt` to `application/vnd.mapbox-vector-tile`
+    - Add new upstream MIME types
+
+2.1.30 / 2021-04-02
+===================
+
+  * deps: mime-db@1.47.0
+    - Add extension `.amr` to `audio/amr`
+    - Remove ambigious extensions from IANA for `application/*+xml` types
+    - Update primary extension to `.es` for `application/ecmascript`
+
+2.1.29 / 2021-02-17
+===================
+
+  * deps: mime-db@1.46.0
+    - Add extension `.amr` to `audio/amr`
+    - Add extension `.m4s` to `video/iso.segment`
+    - Add extension `.opus` to `audio/ogg`
+    - Add new upstream MIME types
+
+2.1.28 / 2021-01-01
+===================
+
+  * deps: mime-db@1.45.0
+    - Add `application/ubjson` with extension `.ubj`
+    - Add `image/avif` with extension `.avif`
+    - Add `image/ktx2` with extension `.ktx2`
+    - Add extension `.dbf` to `application/vnd.dbf`
+    - Add extension `.rar` to `application/vnd.rar`
+    - Add extension `.td` to `application/urc-targetdesc+xml`
+    - Add new upstream MIME types
+    - Fix extension of `application/vnd.apple.keynote` to be `.key`
+
+2.1.27 / 2020-04-23
+===================
+
+  * deps: mime-db@1.44.0
+    - Add charsets from IANA
+    - Add extension `.cjs` to `application/node`
+    - Add new upstream MIME types
+
+2.1.26 / 2020-01-05
+===================
+
+  * deps: mime-db@1.43.0
+    - Add `application/x-keepass2` with extension `.kdbx`
+    - Add extension `.mxmf` to `audio/mobile-xmf`
+    - Add extensions from IANA for `application/*+xml` types
+    - Add new upstream MIME types
+
+2.1.25 / 2019-11-12
+===================
+
+  * deps: mime-db@1.42.0
+    - Add new upstream MIME types
+    - Add `application/toml` with extension `.toml`
+    - Add `image/vnd.ms-dds` with extension `.dds`
+
+2.1.24 / 2019-04-20
+===================
+
+  * deps: mime-db@1.40.0
+    - Add extensions from IANA for `model/*` types
+    - Add `text/mdx` with extension `.mdx`
+
+2.1.23 / 2019-04-17
+===================
+
+  * deps: mime-db@~1.39.0
+    - Add extensions `.siv` and `.sieve` to `application/sieve`
+    - Add new upstream MIME types
+
+2.1.22 / 2019-02-14
+===================
+
+  * deps: mime-db@~1.38.0
+    - Add extension `.nq` to `application/n-quads`
+    - Add extension `.nt` to `application/n-triples`
+    - Add new upstream MIME types
+
+2.1.21 / 2018-10-19
+===================
+
+  * deps: mime-db@~1.37.0
+    - Add extensions to HEIC image types
+    - Add new upstream MIME types
+
+2.1.20 / 2018-08-26
+===================
+
+  * deps: mime-db@~1.36.0
+    - Add Apple file extensions from IANA
+    - Add extensions from IANA for `image/*` types
+    - Add new upstream MIME types
+
+2.1.19 / 2018-07-17
+===================
+
+  * deps: mime-db@~1.35.0
+    - Add extension `.csl` to `application/vnd.citationstyles.style+xml`
+    - Add extension `.es` to `application/ecmascript`
+    - Add extension `.owl` to `application/rdf+xml`
+    - Add new upstream MIME types
+    - Add UTF-8 as default charset for `text/turtle`
+
+2.1.18 / 2018-02-16
+===================
+
+  * deps: mime-db@~1.33.0
+    - Add `application/raml+yaml` with extension `.raml`
+    - Add `application/wasm` with extension `.wasm`
+    - Add `text/shex` with extension `.shex`
+    - Add extensions for JPEG-2000 images
+    - Add extensions from IANA for `message/*` types
+    - Add new upstream MIME types
+    - Update font MIME types
+    - Update `text/hjson` to registered `application/hjson`
+
+2.1.17 / 2017-09-01
+===================
+
+  * deps: mime-db@~1.30.0
+    - Add `application/vnd.ms-outlook`
+    - Add `application/x-arj`
+    - Add extension `.mjs` to `application/javascript`
+    - Add glTF types and extensions
+    - Add new upstream MIME types
+    - Add `text/x-org`
+    - Add VirtualBox MIME types
+    - Fix `source` records for `video/*` types that are IANA
+    - Update `font/opentype` to registered `font/otf`
+
+2.1.16 / 2017-07-24
+===================
+
+  * deps: mime-db@~1.29.0
+    - Add `application/fido.trusted-apps+json`
+    - Add extension `.wadl` to `application/vnd.sun.wadl+xml`
+    - Add extension `.gz` to `application/gzip`
+    - Add new upstream MIME types
+    - Update extensions `.md` and `.markdown` to be `text/markdown`
+
+2.1.15 / 2017-03-23
+===================
+
+  * deps: mime-db@~1.27.0
+    - Add new mime types
+    - Add `image/apng`
+
+2.1.14 / 2017-01-14
+===================
+
+  * deps: mime-db@~1.26.0
+    - Add new mime types
+
+2.1.13 / 2016-11-18
+===================
+
+  * deps: mime-db@~1.25.0
+    - Add new mime types
+
+2.1.12 / 2016-09-18
+===================
+
+  * deps: mime-db@~1.24.0
+    - Add new mime types
+    - Add `audio/mp3`
+
+2.1.11 / 2016-05-01
+===================
+
+  * deps: mime-db@~1.23.0
+    - Add new mime types
+
+2.1.10 / 2016-02-15
+===================
+
+  * deps: mime-db@~1.22.0
+    - Add new mime types
+    - Fix extension of `application/dash+xml`
+    - Update primary extension for `audio/mp4`
+
+2.1.9 / 2016-01-06
+==================
+
+  * deps: mime-db@~1.21.0
+    - Add new mime types
+
+2.1.8 / 2015-11-30
+==================
+
+  * deps: mime-db@~1.20.0
+    - Add new mime types
+
+2.1.7 / 2015-09-20
+==================
+
+  * deps: mime-db@~1.19.0
+    - Add new mime types
+
+2.1.6 / 2015-09-03
+==================
+
+  * deps: mime-db@~1.18.0
+    - Add new mime types
+
+2.1.5 / 2015-08-20
+==================
+
+  * deps: mime-db@~1.17.0
+    - Add new mime types
+
+2.1.4 / 2015-07-30
+==================
+
+  * deps: mime-db@~1.16.0
+    - Add new mime types
+
+2.1.3 / 2015-07-13
+==================
+
+  * deps: mime-db@~1.15.0
+    - Add new mime types
+
+2.1.2 / 2015-06-25
+==================
+
+  * deps: mime-db@~1.14.0
+    - Add new mime types
+
+2.1.1 / 2015-06-08
+==================
+
+  * perf: fix deopt during mapping
+
+2.1.0 / 2015-06-07
+==================
+
+  * Fix incorrectly treating extension-less file name as extension
+    - i.e. `'path/to/json'` will no longer return `application/json`
+  * Fix `.charset(type)` to accept parameters
+  * Fix `.charset(type)` to match case-insensitive
+  * Improve generation of extension to MIME mapping
+  * Refactor internals for readability and no argument reassignment
+  * Prefer `application/*` MIME types from the same source
+  * Prefer any type over `application/octet-stream`
+  * deps: mime-db@~1.13.0
+    - Add nginx as a source
+    - Add new mime types
+
+2.0.14 / 2015-06-06
+===================
+
+  * deps: mime-db@~1.12.0
+    - Add new mime types
+
+2.0.13 / 2015-05-31
+===================
+
+  * deps: mime-db@~1.11.0
+    - Add new mime types
+
+2.0.12 / 2015-05-19
+===================
+
+  * deps: mime-db@~1.10.0
+    - Add new mime types
+
+2.0.11 / 2015-05-05
+===================
+
+  * deps: mime-db@~1.9.1
+    - Add new mime types
+
+2.0.10 / 2015-03-13
+===================
+
+  * deps: mime-db@~1.8.0
+    - Add new mime types
+
+2.0.9 / 2015-02-09
+==================
+
+  * deps: mime-db@~1.7.0
+    - Add new mime types
+    - Community extensions ownership transferred from `node-mime`
+
+2.0.8 / 2015-01-29
+==================
+
+  * deps: mime-db@~1.6.0
+    - Add new mime types
+
+2.0.7 / 2014-12-30
+==================
+
+  * deps: mime-db@~1.5.0
+    - Add new mime types
+    - Fix various invalid MIME type entries
+
+2.0.6 / 2014-12-30
+==================
+
+  * deps: mime-db@~1.4.0
+    - Add new mime types
+    - Fix various invalid MIME type entries
+    - Remove example template MIME types
+
+2.0.5 / 2014-12-29
+==================
+
+  * deps: mime-db@~1.3.1
+    - Fix missing extensions
+
+2.0.4 / 2014-12-10
+==================
+
+  * deps: mime-db@~1.3.0
+    - Add new mime types
+
+2.0.3 / 2014-11-09
+==================
+
+  * deps: mime-db@~1.2.0
+    - Add new mime types
+
+2.0.2 / 2014-09-28
+==================
+
+  * deps: mime-db@~1.1.0
+    - Add new mime types
+    - Update charsets
+
+2.0.1 / 2014-09-07
+==================
+
+  * Support Node.js 0.6
+
+2.0.0 / 2014-09-02
+==================
+
+  * Use `mime-db`
+  * Remove `.define()`
+
+1.0.2 / 2014-08-04
+==================
+
+  * Set charset=utf-8 for `text/javascript`
+
+1.0.1 / 2014-06-24
+==================
+
+  * Add `text/jsx` type
+
+1.0.0 / 2014-05-12
+==================
+
+  * Return `false` for unknown types
+  * Set charset=utf-8 for `application/json`
+
+0.1.0 / 2014-05-02
+==================
+
+  * Initial release

node_modules/engine.io/node_modules/mime-types/LICENSE

@@ -0,0 +1,23 @@
+(The MIT License)
+
+Copyright (c) 2014 Jonathan Ong <me@jongleberry.com>
+Copyright (c) 2015 Douglas Christopher Wilson <doug@somethingdoug.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/engine.io/node_modules/mime-types/README.md

@@ -0,0 +1,113 @@
+# mime-types
+
+[![NPM Version][npm-version-image]][npm-url]
+[![NPM Downloads][npm-downloads-image]][npm-url]
+[![Node.js Version][node-version-image]][node-version-url]
+[![Build Status][ci-image]][ci-url]
+[![Test Coverage][coveralls-image]][coveralls-url]
+
+The ultimate javascript content-type utility.
+
+Similar to [the `mime@1.x` module](https://www.npmjs.com/package/mime), except:
+
+- __No fallbacks.__ Instead of naively returning the first available type,
+  `mime-types` simply returns `false`, so do
+  `var type = mime.lookup('unrecognized') || 'application/octet-stream'`.
+- No `new Mime()` business, so you could do `var lookup = require('mime-types').lookup`.
+- No `.define()` functionality
+- Bug fixes for `.lookup(path)`
+
+Otherwise, the API is compatible with `mime` 1.x.
+
+## Install
+
+This is a [Node.js](https://nodejs.org/en/) module available through the
+[npm registry](https://www.npmjs.com/). Installation is done using the
+[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
+
+```sh
+$ npm install mime-types
+```
+
+## Adding Types
+
+All mime types are based on [mime-db](https://www.npmjs.com/package/mime-db),
+so open a PR there if you'd like to add mime types.
+
+## API
+
+```js
+var mime = require('mime-types')
+```
+
+All functions return `false` if input is invalid or not found.
+
+### mime.lookup(path)
+
+Lookup the content-type associated with a file.
+
+```js
+mime.lookup('json') // 'application/json'
+mime.lookup('.md') // 'text/markdown'
+mime.lookup('file.html') // 'text/html'
+mime.lookup('folder/file.js') // 'application/javascript'
+mime.lookup('folder/.htaccess') // false
+
+mime.lookup('cats') // false
+```
+
+### mime.contentType(type)
+
+Create a full content-type header given a content-type or extension.
+When given an extension, `mime.lookup` is used to get the matching
+content-type, otherwise the given content-type is used. Then if the
+content-type does not already have a `charset` parameter, `mime.charset`
+is used to get the default charset and add to the returned content-type.
+
+```js
+mime.contentType('markdown') // 'text/x-markdown; charset=utf-8'
+mime.contentType('file.json') // 'application/json; charset=utf-8'
+mime.contentType('text/html') // 'text/html; charset=utf-8'
+mime.contentType('text/html; charset=iso-8859-1') // 'text/html; charset=iso-8859-1'
+
+// from a full path
+mime.contentType(path.extname('/path/to/file.json')) // 'application/json; charset=utf-8'
+```
+
+### mime.extension(type)
+
+Get the default extension for a content-type.
+
+```js
+mime.extension('application/octet-stream') // 'bin'
+```
+
+### mime.charset(type)
+
+Lookup the implied default charset of a content-type.
+
+```js
+mime.charset('text/markdown') // 'UTF-8'
+```
+
+### var type = mime.types[extension]
+
+A map of content-types by extension.
+
+### [extensions...] = mime.extensions[type]
+
+A map of extensions by content-type.
+
+## License
+
+[MIT](LICENSE)
+
+[ci-image]: https://badgen.net/github/checks/jshttp/mime-types/master?label=ci
+[ci-url]: https://github.com/jshttp/mime-types/actions/workflows/ci.yml
+[coveralls-image]: https://badgen.net/coveralls/c/github/jshttp/mime-types/master
+[coveralls-url]: https://coveralls.io/r/jshttp/mime-types?branch=master
+[node-version-image]: https://badgen.net/npm/node/mime-types
+[node-version-url]: https://nodejs.org/en/download
+[npm-downloads-image]: https://badgen.net/npm/dm/mime-types
+[npm-url]: https://npmjs.org/package/mime-types
+[npm-version-image]: https://badgen.net/npm/v/mime-types

node_modules/engine.io/node_modules/mime-types/index.js

@@ -0,0 +1,188 @@
+/*!
+ * mime-types
+ * Copyright(c) 2014 Jonathan Ong
+ * Copyright(c) 2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict'
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var db = require('mime-db')
+var extname = require('path').extname
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var EXTRACT_TYPE_REGEXP = /^\s*([^;\s]*)(?:;|\s|$)/
+var TEXT_TYPE_REGEXP = /^text\//i
+
+/**
+ * Module exports.
+ * @public
+ */
+
+exports.charset = charset
+exports.charsets = { lookup: charset }
+exports.contentType = contentType
+exports.extension = extension
+exports.extensions = Object.create(null)
+exports.lookup = lookup
+exports.types = Object.create(null)
+
+// Populate the extensions/types maps
+populateMaps(exports.extensions, exports.types)
+
+/**
+ * Get the default charset for a MIME type.
+ *
+ * @param {string} type
+ * @return {boolean|string}
+ */
+
+function charset (type) {
+  if (!type || typeof type !== 'string') {
+    return false
+  }
+
+  // TODO: use media-typer
+  var match = EXTRACT_TYPE_REGEXP.exec(type)
+  var mime = match && db[match[1].toLowerCase()]
+
+  if (mime && mime.charset) {
+    return mime.charset
+  }
+
+  // default text/* to utf-8
+  if (match && TEXT_TYPE_REGEXP.test(match[1])) {
+    return 'UTF-8'
+  }
+
+  return false
+}
+
+/**
+ * Create a full Content-Type header given a MIME type or extension.
+ *
+ * @param {string} str
+ * @return {boolean|string}
+ */
+
+function contentType (str) {
+  // TODO: should this even be in this module?
+  if (!str || typeof str !== 'string') {
+    return false
+  }
+
+  var mime = str.indexOf('/') === -1
+    ? exports.lookup(str)
+    : str
+
+  if (!mime) {
+    return false
+  }
+
+  // TODO: use content-type or other module
+  if (mime.indexOf('charset') === -1) {
+    var charset = exports.charset(mime)
+    if (charset) mime += '; charset=' + charset.toLowerCase()
+  }
+
+  return mime
+}
+
+/**
+ * Get the default extension for a MIME type.
+ *
+ * @param {string} type
+ * @return {boolean|string}
+ */
+
+function extension (type) {
+  if (!type || typeof type !== 'string') {
+    return false
+  }
+
+  // TODO: use media-typer
+  var match = EXTRACT_TYPE_REGEXP.exec(type)
+
+  // get extensions
+  var exts = match && exports.extensions[match[1].toLowerCase()]
+
+  if (!exts || !exts.length) {
+    return false
+  }
+
+  return exts[0]
+}
+
+/**
+ * Lookup the MIME type for a file path/extension.
+ *
+ * @param {string} path
+ * @return {boolean|string}
+ */
+
+function lookup (path) {
+  if (!path || typeof path !== 'string') {
+    return false
+  }
+
+  // get the extension ("ext" or ".ext" or full path)
+  var extension = extname('x.' + path)
+    .toLowerCase()
+    .substr(1)
+
+  if (!extension) {
+    return false
+  }
+
+  return exports.types[extension] || false
+}
+
+/**
+ * Populate the extensions and types maps.
+ * @private
+ */
+
+function populateMaps (extensions, types) {
+  // source preference (least -> most)
+  var preference = ['nginx', 'apache', undefined, 'iana']
+
+  Object.keys(db).forEach(function forEachMimeType (type) {
+    var mime = db[type]
+    var exts = mime.extensions
+
+    if (!exts || !exts.length) {
+      return
+    }
+
+    // mime -> extensions
+    extensions[type] = exts
+
+    // extension -> mime
+    for (var i = 0; i < exts.length; i++) {
+      var extension = exts[i]
+
+      if (types[extension]) {
+        var from = preference.indexOf(db[types[extension]].source)
+        var to = preference.indexOf(mime.source)
+
+        if (types[extension] !== 'application/octet-stream' &&
+          (from > to || (from === to && types[extension].substr(0, 12) === 'application/'))) {
+          // skip the remapping
+          continue
+        }
+      }
+
+      // set the extension -> mime
+      types[extension] = type
+    }
+  })
+}

node_modules/engine.io/node_modules/mime-types/package.json

@@ -0,0 +1,44 @@
+{
+  "name": "mime-types",
+  "description": "The ultimate javascript content-type utility.",
+  "version": "2.1.35",
+  "contributors": [
+    "Douglas Christopher Wilson <doug@somethingdoug.com>",
+    "Jeremiah Senkpiel <fishrock123@rocketmail.com> (https://searchbeam.jit.su)",
+    "Jonathan Ong <me@jongleberry.com> (http://jongleberry.com)"
+  ],
+  "license": "MIT",
+  "keywords": [
+    "mime",
+    "types"
+  ],
+  "repository": "jshttp/mime-types",
+  "dependencies": {
+    "mime-db": "1.52.0"
+  },
+  "devDependencies": {
+    "eslint": "7.32.0",
+    "eslint-config-standard": "14.1.1",
+    "eslint-plugin-import": "2.25.4",
+    "eslint-plugin-markdown": "2.2.1",
+    "eslint-plugin-node": "11.1.0",
+    "eslint-plugin-promise": "5.2.0",
+    "eslint-plugin-standard": "4.1.0",
+    "mocha": "9.2.2",
+    "nyc": "15.1.0"
+  },
+  "files": [
+    "HISTORY.md",
+    "LICENSE",
+    "index.js"
+  ],
+  "engines": {
+    "node": ">= 0.6"
+  },
+  "scripts": {
+    "lint": "eslint .",
+    "test": "mocha --reporter spec test/test.js",
+    "test-ci": "nyc --reporter=lcov --reporter=text npm test",
+    "test-cov": "nyc --reporter=html --reporter=text npm test"
+  }
+}

node_modules/engine.io/node_modules/negotiator/HISTORY.md

@@ -0,0 +1,108 @@
+0.6.3 / 2022-01-22
+==================
+
+  * Revert "Lazy-load modules from main entry point"
+
+0.6.2 / 2019-04-29
+==================
+
+  * Fix sorting charset, encoding, and language with extra parameters
+
+0.6.1 / 2016-05-02
+==================
+
+  * perf: improve `Accept` parsing speed
+  * perf: improve `Accept-Charset` parsing speed
+  * perf: improve `Accept-Encoding` parsing speed
+  * perf: improve `Accept-Language` parsing speed
+
+0.6.0 / 2015-09-29
+==================
+
+  * Fix including type extensions in parameters in `Accept` parsing
+  * Fix parsing `Accept` parameters with quoted equals
+  * Fix parsing `Accept` parameters with quoted semicolons
+  * Lazy-load modules from main entry point
+  * perf: delay type concatenation until needed
+  * perf: enable strict mode
+  * perf: hoist regular expressions
+  * perf: remove closures getting spec properties
+  * perf: remove a closure from media type parsing
+  * perf: remove property delete from media type parsing
+
+0.5.3 / 2015-05-10
+==================
+
+  * Fix media type parameter matching to be case-insensitive
+
+0.5.2 / 2015-05-06
+==================
+
+  * Fix comparing media types with quoted values
+  * Fix splitting media types with quoted commas
+
+0.5.1 / 2015-02-14
+==================
+
+  * Fix preference sorting to be stable for long acceptable lists
+
+0.5.0 / 2014-12-18
+==================
+
+  * Fix list return order when large accepted list
+  * Fix missing identity encoding when q=0 exists
+  * Remove dynamic building of Negotiator class
+
+0.4.9 / 2014-10-14
+==================
+
+  * Fix error when media type has invalid parameter
+
+0.4.8 / 2014-09-28
+==================
+
+  * Fix all negotiations to be case-insensitive
+  * Stable sort preferences of same quality according to client order
+  * Support Node.js 0.6
+
+0.4.7 / 2014-06-24
+==================
+
+  * Handle invalid provided languages
+  * Handle invalid provided media types
+
+0.4.6 / 2014-06-11
+==================
+
+  *  Order by specificity when quality is the same
+
+0.4.5 / 2014-05-29
+==================
+
+  * Fix regression in empty header handling
+
+0.4.4 / 2014-05-29
+==================
+
+  * Fix behaviors when headers are not present
+
+0.4.3 / 2014-04-16
+==================
+
+  * Handle slashes on media params correctly
+
+0.4.2 / 2014-02-28
+==================
+
+  * Fix media type sorting
+  * Handle media types params strictly
+
+0.4.1 / 2014-01-16
+==================
+
+  * Use most specific matches
+
+0.4.0 / 2014-01-09
+==================
+
+  * Remove preferred prefix from methods

node_modules/engine.io/node_modules/negotiator/LICENSE

@@ -0,0 +1,24 @@
+(The MIT License)
+
+Copyright (c) 2012-2014 Federico Romero
+Copyright (c) 2012-2014 Isaac Z. Schlueter
+Copyright (c) 2014-2015 Douglas Christopher Wilson
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/engine.io/node_modules/negotiator/README.md

@@ -0,0 +1,203 @@
+# negotiator
+
+[![NPM Version][npm-image]][npm-url]
+[![NPM Downloads][downloads-image]][downloads-url]
+[![Node.js Version][node-version-image]][node-version-url]
+[![Build Status][github-actions-ci-image]][github-actions-ci-url]
+[![Test Coverage][coveralls-image]][coveralls-url]
+
+An HTTP content negotiator for Node.js
+
+## Installation
+
+```sh
+$ npm install negotiator
+```
+
+## API
+
+```js
+var Negotiator = require('negotiator')
+```
+
+### Accept Negotiation
+
+```js
+availableMediaTypes = ['text/html', 'text/plain', 'application/json']
+
+// The negotiator constructor receives a request object
+negotiator = new Negotiator(request)
+
+// Let's say Accept header is 'text/html, application/*;q=0.2, image/jpeg;q=0.8'
+
+negotiator.mediaTypes()
+// -> ['text/html', 'image/jpeg', 'application/*']
+
+negotiator.mediaTypes(availableMediaTypes)
+// -> ['text/html', 'application/json']
+
+negotiator.mediaType(availableMediaTypes)
+// -> 'text/html'
+```
+
+You can check a working example at `examples/accept.js`.
+
+#### Methods
+
+##### mediaType()
+
+Returns the most preferred media type from the client.
+
+##### mediaType(availableMediaType)
+
+Returns the most preferred media type from a list of available media types.
+
+##### mediaTypes()
+
+Returns an array of preferred media types ordered by the client preference.
+
+##### mediaTypes(availableMediaTypes)
+
+Returns an array of preferred media types ordered by priority from a list of
+available media types.
+
+### Accept-Language Negotiation
+
+```js
+negotiator = new Negotiator(request)
+
+availableLanguages = ['en', 'es', 'fr']
+
+// Let's say Accept-Language header is 'en;q=0.8, es, pt'
+
+negotiator.languages()
+// -> ['es', 'pt', 'en']
+
+negotiator.languages(availableLanguages)
+// -> ['es', 'en']
+
+language = negotiator.language(availableLanguages)
+// -> 'es'
+```
+
+You can check a working example at `examples/language.js`.
+
+#### Methods
+
+##### language()
+
+Returns the most preferred language from the client.
+
+##### language(availableLanguages)
+
+Returns the most preferred language from a list of available languages.
+
+##### languages()
+
+Returns an array of preferred languages ordered by the client preference.
+
+##### languages(availableLanguages)
+
+Returns an array of preferred languages ordered by priority from a list of
+available languages.
+
+### Accept-Charset Negotiation
+
+```js
+availableCharsets = ['utf-8', 'iso-8859-1', 'iso-8859-5']
+
+negotiator = new Negotiator(request)
+
+// Let's say Accept-Charset header is 'utf-8, iso-8859-1;q=0.8, utf-7;q=0.2'
+
+negotiator.charsets()
+// -> ['utf-8', 'iso-8859-1', 'utf-7']
+
+negotiator.charsets(availableCharsets)
+// -> ['utf-8', 'iso-8859-1']
+
+negotiator.charset(availableCharsets)
+// -> 'utf-8'
+```
+
+You can check a working example at `examples/charset.js`.
+
+#### Methods
+
+##### charset()
+
+Returns the most preferred charset from the client.
+
+##### charset(availableCharsets)
+
+Returns the most preferred charset from a list of available charsets.
+
+##### charsets()
+
+Returns an array of preferred charsets ordered by the client preference.
+
+##### charsets(availableCharsets)
+
+Returns an array of preferred charsets ordered by priority from a list of
+available charsets.
+
+### Accept-Encoding Negotiation
+
+```js
+availableEncodings = ['identity', 'gzip']
+
+negotiator = new Negotiator(request)
+
+// Let's say Accept-Encoding header is 'gzip, compress;q=0.2, identity;q=0.5'
+
+negotiator.encodings()
+// -> ['gzip', 'identity', 'compress']
+
+negotiator.encodings(availableEncodings)
+// -> ['gzip', 'identity']
+
+negotiator.encoding(availableEncodings)
+// -> 'gzip'
+```
+
+You can check a working example at `examples/encoding.js`.
+
+#### Methods
+
+##### encoding()
+
+Returns the most preferred encoding from the client.
+
+##### encoding(availableEncodings)
+
+Returns the most preferred encoding from a list of available encodings.
+
+##### encodings()
+
+Returns an array of preferred encodings ordered by the client preference.
+
+##### encodings(availableEncodings)
+
+Returns an array of preferred encodings ordered by priority from a list of
+available encodings.
+
+## See Also
+
+The [accepts](https://npmjs.org/package/accepts#readme) module builds on
+this module and provides an alternative interface, mime type validation,
+and more.
+
+## License
+
+[MIT](LICENSE)
+
+[npm-image]: https://img.shields.io/npm/v/negotiator.svg
+[npm-url]: https://npmjs.org/package/negotiator
+[node-version-image]: https://img.shields.io/node/v/negotiator.svg
+[node-version-url]: https://nodejs.org/en/download/
+[coveralls-image]: https://img.shields.io/coveralls/jshttp/negotiator/master.svg
+[coveralls-url]: https://coveralls.io/r/jshttp/negotiator?branch=master
+[downloads-image]: https://img.shields.io/npm/dm/negotiator.svg
+[downloads-url]: https://npmjs.org/package/negotiator
+[github-actions-ci-image]: https://img.shields.io/github/workflow/status/jshttp/negotiator/ci/master?label=ci
+[github-actions-ci-url]: https://github.com/jshttp/negotiator/actions/workflows/ci.yml

node_modules/engine.io/node_modules/negotiator/index.js

@@ -0,0 +1,82 @@
+/*!
+ * negotiator
+ * Copyright(c) 2012 Federico Romero
+ * Copyright(c) 2012-2014 Isaac Z. Schlueter
+ * Copyright(c) 2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+var preferredCharsets = require('./lib/charset')
+var preferredEncodings = require('./lib/encoding')
+var preferredLanguages = require('./lib/language')
+var preferredMediaTypes = require('./lib/mediaType')
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = Negotiator;
+module.exports.Negotiator = Negotiator;
+
+/**
+ * Create a Negotiator instance from a request.
+ * @param {object} request
+ * @public
+ */
+
+function Negotiator(request) {
+  if (!(this instanceof Negotiator)) {
+    return new Negotiator(request);
+  }
+
+  this.request = request;
+}
+
+Negotiator.prototype.charset = function charset(available) {
+  var set = this.charsets(available);
+  return set && set[0];
+};
+
+Negotiator.prototype.charsets = function charsets(available) {
+  return preferredCharsets(this.request.headers['accept-charset'], available);
+};
+
+Negotiator.prototype.encoding = function encoding(available) {
+  var set = this.encodings(available);
+  return set && set[0];
+};
+
+Negotiator.prototype.encodings = function encodings(available) {
+  return preferredEncodings(this.request.headers['accept-encoding'], available);
+};
+
+Negotiator.prototype.language = function language(available) {
+  var set = this.languages(available);
+  return set && set[0];
+};
+
+Negotiator.prototype.languages = function languages(available) {
+  return preferredLanguages(this.request.headers['accept-language'], available);
+};
+
+Negotiator.prototype.mediaType = function mediaType(available) {
+  var set = this.mediaTypes(available);
+  return set && set[0];
+};
+
+Negotiator.prototype.mediaTypes = function mediaTypes(available) {
+  return preferredMediaTypes(this.request.headers.accept, available);
+};
+
+// Backwards compatibility
+Negotiator.prototype.preferredCharset = Negotiator.prototype.charset;
+Negotiator.prototype.preferredCharsets = Negotiator.prototype.charsets;
+Negotiator.prototype.preferredEncoding = Negotiator.prototype.encoding;
+Negotiator.prototype.preferredEncodings = Negotiator.prototype.encodings;
+Negotiator.prototype.preferredLanguage = Negotiator.prototype.language;
+Negotiator.prototype.preferredLanguages = Negotiator.prototype.languages;
+Negotiator.prototype.preferredMediaType = Negotiator.prototype.mediaType;
+Negotiator.prototype.preferredMediaTypes = Negotiator.prototype.mediaTypes;

node_modules/engine.io/node_modules/negotiator/lib/charset.js

@@ -0,0 +1,169 @@
+/**
+ * negotiator
+ * Copyright(c) 2012 Isaac Z. Schlueter
+ * Copyright(c) 2014 Federico Romero
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = preferredCharsets;
+module.exports.preferredCharsets = preferredCharsets;
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var simpleCharsetRegExp = /^\s*([^\s;]+)\s*(?:;(.*))?$/;
+
+/**
+ * Parse the Accept-Charset header.
+ * @private
+ */
+
+function parseAcceptCharset(accept) {
+  var accepts = accept.split(',');
+
+  for (var i = 0, j = 0; i < accepts.length; i++) {
+    var charset = parseCharset(accepts[i].trim(), i);
+
+    if (charset) {
+      accepts[j++] = charset;
+    }
+  }
+
+  // trim accepts
+  accepts.length = j;
+
+  return accepts;
+}
+
+/**
+ * Parse a charset from the Accept-Charset header.
+ * @private
+ */
+
+function parseCharset(str, i) {
+  var match = simpleCharsetRegExp.exec(str);
+  if (!match) return null;
+
+  var charset = match[1];
+  var q = 1;
+  if (match[2]) {
+    var params = match[2].split(';')
+    for (var j = 0; j < params.length; j++) {
+      var p = params[j].trim().split('=');
+      if (p[0] === 'q') {
+        q = parseFloat(p[1]);
+        break;
+      }
+    }
+  }
+
+  return {
+    charset: charset,
+    q: q,
+    i: i
+  };
+}
+
+/**
+ * Get the priority of a charset.
+ * @private
+ */
+
+function getCharsetPriority(charset, accepted, index) {
+  var priority = {o: -1, q: 0, s: 0};
+
+  for (var i = 0; i < accepted.length; i++) {
+    var spec = specify(charset, accepted[i], index);
+
+    if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {
+      priority = spec;
+    }
+  }
+
+  return priority;
+}
+
+/**
+ * Get the specificity of the charset.
+ * @private
+ */
+
+function specify(charset, spec, index) {
+  var s = 0;
+  if(spec.charset.toLowerCase() === charset.toLowerCase()){
+    s |= 1;
+  } else if (spec.charset !== '*' ) {
+    return null
+  }
+
+  return {
+    i: index,
+    o: spec.i,
+    q: spec.q,
+    s: s
+  }
+}
+
+/**
+ * Get the preferred charsets from an Accept-Charset header.
+ * @public
+ */
+
+function preferredCharsets(accept, provided) {
+  // RFC 2616 sec 14.2: no header = *
+  var accepts = parseAcceptCharset(accept === undefined ? '*' : accept || '');
+
+  if (!provided) {
+    // sorted list of all charsets
+    return accepts
+      .filter(isQuality)
+      .sort(compareSpecs)
+      .map(getFullCharset);
+  }
+
+  var priorities = provided.map(function getPriority(type, index) {
+    return getCharsetPriority(type, accepts, index);
+  });
+
+  // sorted list of accepted charsets
+  return priorities.filter(isQuality).sort(compareSpecs).map(function getCharset(priority) {
+    return provided[priorities.indexOf(priority)];
+  });
+}
+
+/**
+ * Compare two specs.
+ * @private
+ */
+
+function compareSpecs(a, b) {
+  return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i) || 0;
+}
+
+/**
+ * Get full charset string.
+ * @private
+ */
+
+function getFullCharset(spec) {
+  return spec.charset;
+}
+
+/**
+ * Check if a spec has any quality.
+ * @private
+ */
+
+function isQuality(spec) {
+  return spec.q > 0;
+}

node_modules/engine.io/node_modules/negotiator/lib/encoding.js

@@ -0,0 +1,184 @@
+/**
+ * negotiator
+ * Copyright(c) 2012 Isaac Z. Schlueter
+ * Copyright(c) 2014 Federico Romero
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = preferredEncodings;
+module.exports.preferredEncodings = preferredEncodings;
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var simpleEncodingRegExp = /^\s*([^\s;]+)\s*(?:;(.*))?$/;
+
+/**
+ * Parse the Accept-Encoding header.
+ * @private
+ */
+
+function parseAcceptEncoding(accept) {
+  var accepts = accept.split(',');
+  var hasIdentity = false;
+  var minQuality = 1;
+
+  for (var i = 0, j = 0; i < accepts.length; i++) {
+    var encoding = parseEncoding(accepts[i].trim(), i);
+
+    if (encoding) {
+      accepts[j++] = encoding;
+      hasIdentity = hasIdentity || specify('identity', encoding);
+      minQuality = Math.min(minQuality, encoding.q || 1);
+    }
+  }
+
+  if (!hasIdentity) {
+    /*
+     * If identity doesn't explicitly appear in the accept-encoding header,
+     * it's added to the list of acceptable encoding with the lowest q
+     */
+    accepts[j++] = {
+      encoding: 'identity',
+      q: minQuality,
+      i: i
+    };
+  }
+
+  // trim accepts
+  accepts.length = j;
+
+  return accepts;
+}
+
+/**
+ * Parse an encoding from the Accept-Encoding header.
+ * @private
+ */
+
+function parseEncoding(str, i) {
+  var match = simpleEncodingRegExp.exec(str);
+  if (!match) return null;
+
+  var encoding = match[1];
+  var q = 1;
+  if (match[2]) {
+    var params = match[2].split(';');
+    for (var j = 0; j < params.length; j++) {
+      var p = params[j].trim().split('=');
+      if (p[0] === 'q') {
+        q = parseFloat(p[1]);
+        break;
+      }
+    }
+  }
+
+  return {
+    encoding: encoding,
+    q: q,
+    i: i
+  };
+}
+
+/**
+ * Get the priority of an encoding.
+ * @private
+ */
+
+function getEncodingPriority(encoding, accepted, index) {
+  var priority = {o: -1, q: 0, s: 0};
+
+  for (var i = 0; i < accepted.length; i++) {
+    var spec = specify(encoding, accepted[i], index);
+
+    if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {
+      priority = spec;
+    }
+  }
+
+  return priority;
+}
+
+/**
+ * Get the specificity of the encoding.
+ * @private
+ */
+
+function specify(encoding, spec, index) {
+  var s = 0;
+  if(spec.encoding.toLowerCase() === encoding.toLowerCase()){
+    s |= 1;
+  } else if (spec.encoding !== '*' ) {
+    return null
+  }
+
+  return {
+    i: index,
+    o: spec.i,
+    q: spec.q,
+    s: s
+  }
+};
+
+/**
+ * Get the preferred encodings from an Accept-Encoding header.
+ * @public
+ */
+
+function preferredEncodings(accept, provided) {
+  var accepts = parseAcceptEncoding(accept || '');
+
+  if (!provided) {
+    // sorted list of all encodings
+    return accepts
+      .filter(isQuality)
+      .sort(compareSpecs)
+      .map(getFullEncoding);
+  }
+
+  var priorities = provided.map(function getPriority(type, index) {
+    return getEncodingPriority(type, accepts, index);
+  });
+
+  // sorted list of accepted encodings
+  return priorities.filter(isQuality).sort(compareSpecs).map(function getEncoding(priority) {
+    return provided[priorities.indexOf(priority)];
+  });
+}
+
+/**
+ * Compare two specs.
+ * @private
+ */
+
+function compareSpecs(a, b) {
+  return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i) || 0;
+}
+
+/**
+ * Get full encoding string.
+ * @private
+ */
+
+function getFullEncoding(spec) {
+  return spec.encoding;
+}
+
+/**
+ * Check if a spec has any quality.
+ * @private
+ */
+
+function isQuality(spec) {
+  return spec.q > 0;
+}

node_modules/engine.io/node_modules/negotiator/lib/language.js

@@ -0,0 +1,179 @@
+/**
+ * negotiator
+ * Copyright(c) 2012 Isaac Z. Schlueter
+ * Copyright(c) 2014 Federico Romero
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = preferredLanguages;
+module.exports.preferredLanguages = preferredLanguages;
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var simpleLanguageRegExp = /^\s*([^\s\-;]+)(?:-([^\s;]+))?\s*(?:;(.*))?$/;
+
+/**
+ * Parse the Accept-Language header.
+ * @private
+ */
+
+function parseAcceptLanguage(accept) {
+  var accepts = accept.split(',');
+
+  for (var i = 0, j = 0; i < accepts.length; i++) {
+    var language = parseLanguage(accepts[i].trim(), i);
+
+    if (language) {
+      accepts[j++] = language;
+    }
+  }
+
+  // trim accepts
+  accepts.length = j;
+
+  return accepts;
+}
+
+/**
+ * Parse a language from the Accept-Language header.
+ * @private
+ */
+
+function parseLanguage(str, i) {
+  var match = simpleLanguageRegExp.exec(str);
+  if (!match) return null;
+
+  var prefix = match[1]
+  var suffix = match[2]
+  var full = prefix
+
+  if (suffix) full += "-" + suffix;
+
+  var q = 1;
+  if (match[3]) {
+    var params = match[3].split(';')
+    for (var j = 0; j < params.length; j++) {
+      var p = params[j].split('=');
+      if (p[0] === 'q') q = parseFloat(p[1]);
+    }
+  }
+
+  return {
+    prefix: prefix,
+    suffix: suffix,
+    q: q,
+    i: i,
+    full: full
+  };
+}
+
+/**
+ * Get the priority of a language.
+ * @private
+ */
+
+function getLanguagePriority(language, accepted, index) {
+  var priority = {o: -1, q: 0, s: 0};
+
+  for (var i = 0; i < accepted.length; i++) {
+    var spec = specify(language, accepted[i], index);
+
+    if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {
+      priority = spec;
+    }
+  }
+
+  return priority;
+}
+
+/**
+ * Get the specificity of the language.
+ * @private
+ */
+
+function specify(language, spec, index) {
+  var p = parseLanguage(language)
+  if (!p) return null;
+  var s = 0;
+  if(spec.full.toLowerCase() === p.full.toLowerCase()){
+    s |= 4;
+  } else if (spec.prefix.toLowerCase() === p.full.toLowerCase()) {
+    s |= 2;
+  } else if (spec.full.toLowerCase() === p.prefix.toLowerCase()) {
+    s |= 1;
+  } else if (spec.full !== '*' ) {
+    return null
+  }
+
+  return {
+    i: index,
+    o: spec.i,
+    q: spec.q,
+    s: s
+  }
+};
+
+/**
+ * Get the preferred languages from an Accept-Language header.
+ * @public
+ */
+
+function preferredLanguages(accept, provided) {
+  // RFC 2616 sec 14.4: no header = *
+  var accepts = parseAcceptLanguage(accept === undefined ? '*' : accept || '');
+
+  if (!provided) {
+    // sorted list of all languages
+    return accepts
+      .filter(isQuality)
+      .sort(compareSpecs)
+      .map(getFullLanguage);
+  }
+
+  var priorities = provided.map(function getPriority(type, index) {
+    return getLanguagePriority(type, accepts, index);
+  });
+
+  // sorted list of accepted languages
+  return priorities.filter(isQuality).sort(compareSpecs).map(function getLanguage(priority) {
+    return provided[priorities.indexOf(priority)];
+  });
+}
+
+/**
+ * Compare two specs.
+ * @private
+ */
+
+function compareSpecs(a, b) {
+  return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i) || 0;
+}
+
+/**
+ * Get full language string.
+ * @private
+ */
+
+function getFullLanguage(spec) {
+  return spec.full;
+}
+
+/**
+ * Check if a spec has any quality.
+ * @private
+ */
+
+function isQuality(spec) {
+  return spec.q > 0;
+}

node_modules/engine.io/node_modules/negotiator/lib/mediaType.js

@@ -0,0 +1,294 @@
+/**
+ * negotiator
+ * Copyright(c) 2012 Isaac Z. Schlueter
+ * Copyright(c) 2014 Federico Romero
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = preferredMediaTypes;
+module.exports.preferredMediaTypes = preferredMediaTypes;
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var simpleMediaTypeRegExp = /^\s*([^\s\/;]+)\/([^;\s]+)\s*(?:;(.*))?$/;
+
+/**
+ * Parse the Accept header.
+ * @private
+ */
+
+function parseAccept(accept) {
+  var accepts = splitMediaTypes(accept);
+
+  for (var i = 0, j = 0; i < accepts.length; i++) {
+    var mediaType = parseMediaType(accepts[i].trim(), i);
+
+    if (mediaType) {
+      accepts[j++] = mediaType;
+    }
+  }
+
+  // trim accepts
+  accepts.length = j;
+
+  return accepts;
+}
+
+/**
+ * Parse a media type from the Accept header.
+ * @private
+ */
+
+function parseMediaType(str, i) {
+  var match = simpleMediaTypeRegExp.exec(str);
+  if (!match) return null;
+
+  var params = Object.create(null);
+  var q = 1;
+  var subtype = match[2];
+  var type = match[1];
+
+  if (match[3]) {
+    var kvps = splitParameters(match[3]).map(splitKeyValuePair);
+
+    for (var j = 0; j < kvps.length; j++) {
+      var pair = kvps[j];
+      var key = pair[0].toLowerCase();
+      var val = pair[1];
+
+      // get the value, unwrapping quotes
+      var value = val && val[0] === '"' && val[val.length - 1] === '"'
+        ? val.substr(1, val.length - 2)
+        : val;
+
+      if (key === 'q') {
+        q = parseFloat(value);
+        break;
+      }
+
+      // store parameter
+      params[key] = value;
+    }
+  }
+
+  return {
+    type: type,
+    subtype: subtype,
+    params: params,
+    q: q,
+    i: i
+  };
+}
+
+/**
+ * Get the priority of a media type.
+ * @private
+ */
+
+function getMediaTypePriority(type, accepted, index) {
+  var priority = {o: -1, q: 0, s: 0};
+
+  for (var i = 0; i < accepted.length; i++) {
+    var spec = specify(type, accepted[i], index);
+
+    if (spec && (priority.s - spec.s || priority.q - spec.q || priority.o - spec.o) < 0) {
+      priority = spec;
+    }
+  }
+
+  return priority;
+}
+
+/**
+ * Get the specificity of the media type.
+ * @private
+ */
+
+function specify(type, spec, index) {
+  var p = parseMediaType(type);
+  var s = 0;
+
+  if (!p) {
+    return null;
+  }
+
+  if(spec.type.toLowerCase() == p.type.toLowerCase()) {
+    s |= 4
+  } else if(spec.type != '*') {
+    return null;
+  }
+
+  if(spec.subtype.toLowerCase() == p.subtype.toLowerCase()) {
+    s |= 2
+  } else if(spec.subtype != '*') {
+    return null;
+  }
+
+  var keys = Object.keys(spec.params);
+  if (keys.length > 0) {
+    if (keys.every(function (k) {
+      return spec.params[k] == '*' || (spec.params[k] || '').toLowerCase() == (p.params[k] || '').toLowerCase();
+    })) {
+      s |= 1
+    } else {
+      return null
+    }
+  }
+
+  return {
+    i: index,
+    o: spec.i,
+    q: spec.q,
+    s: s,
+  }
+}
+
+/**
+ * Get the preferred media types from an Accept header.
+ * @public
+ */
+
+function preferredMediaTypes(accept, provided) {
+  // RFC 2616 sec 14.2: no header = */*
+  var accepts = parseAccept(accept === undefined ? '*/*' : accept || '');
+
+  if (!provided) {
+    // sorted list of all types
+    return accepts
+      .filter(isQuality)
+      .sort(compareSpecs)
+      .map(getFullType);
+  }
+
+  var priorities = provided.map(function getPriority(type, index) {
+    return getMediaTypePriority(type, accepts, index);
+  });
+
+  // sorted list of accepted types
+  return priorities.filter(isQuality).sort(compareSpecs).map(function getType(priority) {
+    return provided[priorities.indexOf(priority)];
+  });
+}
+
+/**
+ * Compare two specs.
+ * @private
+ */
+
+function compareSpecs(a, b) {
+  return (b.q - a.q) || (b.s - a.s) || (a.o - b.o) || (a.i - b.i) || 0;
+}
+
+/**
+ * Get full type string.
+ * @private
+ */
+
+function getFullType(spec) {
+  return spec.type + '/' + spec.subtype;
+}
+
+/**
+ * Check if a spec has any quality.
+ * @private
+ */
+
+function isQuality(spec) {
+  return spec.q > 0;
+}
+
+/**
+ * Count the number of quotes in a string.
+ * @private
+ */
+
+function quoteCount(string) {
+  var count = 0;
+  var index = 0;
+
+  while ((index = string.indexOf('"', index)) !== -1) {
+    count++;
+    index++;
+  }
+
+  return count;
+}
+
+/**
+ * Split a key value pair.
+ * @private
+ */
+
+function splitKeyValuePair(str) {
+  var index = str.indexOf('=');
+  var key;
+  var val;
+
+  if (index === -1) {
+    key = str;
+  } else {
+    key = str.substr(0, index);
+    val = str.substr(index + 1);
+  }
+
+  return [key, val];
+}
+
+/**
+ * Split an Accept header into media types.
+ * @private
+ */
+
+function splitMediaTypes(accept) {
+  var accepts = accept.split(',');
+
+  for (var i = 1, j = 0; i < accepts.length; i++) {
+    if (quoteCount(accepts[j]) % 2 == 0) {
+      accepts[++j] = accepts[i];
+    } else {
+      accepts[j] += ',' + accepts[i];
+    }
+  }
+
+  // trim accepts
+  accepts.length = j + 1;
+
+  return accepts;
+}
+
+/**
+ * Split a string of parameters.
+ * @private
+ */
+
+function splitParameters(str) {
+  var parameters = str.split(';');
+
+  for (var i = 1, j = 0; i < parameters.length; i++) {
+    if (quoteCount(parameters[j]) % 2 == 0) {
+      parameters[++j] = parameters[i];
+    } else {
+      parameters[j] += ';' + parameters[i];
+    }
+  }
+
+  // trim parameters
+  parameters.length = j + 1;
+
+  for (var i = 0; i < parameters.length; i++) {
+    parameters[i] = parameters[i].trim();
+  }
+
+  return parameters;
+}

node_modules/engine.io/node_modules/negotiator/package.json

@@ -0,0 +1,42 @@
+{
+  "name": "negotiator",
+  "description": "HTTP content negotiation",
+  "version": "0.6.3",
+  "contributors": [
+    "Douglas Christopher Wilson <doug@somethingdoug.com>",
+    "Federico Romero <federico.romero@outboxlabs.com>",
+    "Isaac Z. Schlueter <i@izs.me> (http://blog.izs.me/)"
+  ],
+  "license": "MIT",
+  "keywords": [
+    "http",
+    "content negotiation",
+    "accept",
+    "accept-language",
+    "accept-encoding",
+    "accept-charset"
+  ],
+  "repository": "jshttp/negotiator",
+  "devDependencies": {
+    "eslint": "7.32.0",
+    "eslint-plugin-markdown": "2.2.1",
+    "mocha": "9.1.3",
+    "nyc": "15.1.0"
+  },
+  "files": [
+    "lib/",
+    "HISTORY.md",
+    "LICENSE",
+    "index.js",
+    "README.md"
+  ],
+  "engines": {
+    "node": ">= 0.6"
+  },
+  "scripts": {
+    "lint": "eslint .",
+    "test": "mocha --reporter spec --check-leaks --bail test/",
+    "test-ci": "nyc --reporter=lcov --reporter=text npm test",
+    "test-cov": "nyc --reporter=html --reporter=text npm test"
+  }
+}

node_modules/engine.io/package.json

@@ -0,0 +1,70 @@
+{
+  "name": "engine.io",
+  "version": "6.6.5",
+  "description": "The realtime engine behind Socket.IO. Provides the foundation of a bidirectional connection between client and server",
+  "type": "commonjs",
+  "main": "./build/engine.io.js",
+  "types": "./build/engine.io.d.ts",
+  "exports": {
+    "types": "./build/engine.io.d.ts",
+    "import": "./wrapper.mjs",
+    "require": "./build/engine.io.js"
+  },
+  "author": "Guillermo Rauch <guillermo@learnboost.com>",
+  "contributors": [
+    {
+      "name": "Eugen Dueck",
+      "web": "https://github.com/EugenDueck"
+    },
+    {
+      "name": "Afshin Mehrabani",
+      "web": "https://github.com/afshinm"
+    },
+    {
+      "name": "Christoph Dorn",
+      "web": "https://github.com/cadorn"
+    },
+    {
+      "name": "Mark Mokryn",
+      "email": "mokesmokes@gmail.com"
+    }
+  ],
+  "license": "MIT",
+  "dependencies": {
+    "@types/cors": "^2.8.12",
+    "@types/node": ">=10.0.0",
+    "accepts": "~1.3.4",
+    "base64id": "2.0.0",
+    "cookie": "~0.7.2",
+    "cors": "~2.8.5",
+    "debug": "~4.4.1",
+    "engine.io-parser": "~5.2.1",
+    "ws": "~8.18.3"
+  },
+  "scripts": {
+    "compile": "rimraf ./build && tsc",
+    "test": "npm run compile && npm run format:check && npm run test:default && npm run test:compat-v3",
+    "test:default": "mocha --bail --exit",
+    "test:compat-v3": "EIO_CLIENT=3 mocha --exit",
+    "test:eiows": "EIO_WS_ENGINE=eiows mocha --exit",
+    "test:uws": "EIO_WS_ENGINE=uws mocha --exit",
+    "format:check": "prettier --check \"wrapper.mjs\" \"lib/**/*.ts\" \"test/**/*.js\" \"test/webtransport.mjs\"",
+    "format:fix": "prettier --write \"wrapper.mjs\" \"lib/**/*.ts\" \"test/**/*.js\" \"test/webtransport.mjs\"",
+    "prepack": "npm run compile"
+  },
+  "homepage": "https://github.com/socketio/socket.io/tree/main/packages/engine.io#readme",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/socketio/socket.io.git"
+  },
+  "bugs": {
+    "url": "https://github.com/socketio/socket.io/issues"
+  },
+  "files": [
+    "build/",
+    "wrapper.mjs"
+  ],
+  "engines": {
+    "node": ">=10.2.0"
+  }
+}

node_modules/engine.io/wrapper.mjs

@@ -0,0 +1,10 @@
+export {
+  Server,
+  Socket,
+  Transport,
+  transports,
+  listen,
+  attach,
+  parser,
+  protocol,
+} from "./build/engine.io.js";